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From The MathWorks: MATLAB is really a high-level language and interactive environment so that you to perform computationally intensive tasks faster as compared to traditional programming languages like C, C, and Fortran.
Great software. I use it for my work and consulting gigs. Expensive license though, so I switched to online with free streaming alternatives like
A huge selection of functions, great support
Why not using MATLAB online?
Even better is to try using MATLAB online with no download or installation. Just register and start using MATLAB immediately from any device or platform - MAC, PC, Android, iOS
does everything else you ask it to, the limit is just your imagination and abilities
I am deaply concerned for this because in the advantages involved.
If I am due to the opportunity, Ill be sure every student in Africa is definitely your product.
Youd think many needs no further introduction and praise. This is quite clearly the most beneficial and most complex technical computing environment and scripting language etc, in addition to probably the industry standard.
I remember it felt quite unfriendly when I started by it, but I guess any program does. Overall, its definitely quicker to use than another major software alternative of equal strength that I know of
Start acquiring with Matlab - its worthwhile. Great community support about the Mathworks Exchange means youll always reap the benefits of quick advice off their users, along with custom user-submitted scripts, etc. Excellent support from your developers Mathworks too - most of the feedback suggestions I delivered to them were implemented in subsequent versions, which is usually a pleasant suprise when due to a big software company.
this method very fantastic.
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MathWorks would be the leading developer of mathematical computing software for engineers and scientists.
1994-2015 The MathWorks, Inc.
MATLAB math programming application written by MathWorks. Quoting off their web page : MATLAB is often a high-level language and interactive environment for numerical computation, visualization, and programming.
MATLAB is really a complete environment for high-level programming, along with interactive data analysis. MATLAB excels at numerical computations, specially when dealing with vectors or matrices of knowledge. Symbolic math can be obtained through an add-on toolbox using a MuPAD kernel.
There a variety of add-on toolboxes that extend MATLAB to specific aspects of functionality, including statistics, finance, signal processing, image processing, bioinformatics, etc. You can find a summary of toolboxes made by MathWorks. There is also a list /products/connectionsof some add-on products produced and sold by other programs, and many users place their own functions or collections of functions within the MATLAB Central File Exchange.
Questions regarding the name MATLAB often arise. MATLAB symbolizes MATrix LABoratory. See this introduction to MATLAB.
This wiki contains solutions to questions commonly answered about the newsgroup sometimes abbreviated cssm, which is usually a forum for discussing the business of the usage of MATLAB. It occasionally includes questions associated with similar software applications like Octave. Any topic in connection with MATLAB is acceptable. Additionally, there will likely be occasional discussions regarding related math topics inside a more abstract form.
Before posting, please skim through this document to determine if your question was already answered. If it is have not, there might be information here that will assist you better view the issue and phrase your question.
This Wiki FAQ was entered November 2010 on the Google cache in the old original Mathworks FAQ.
GNU Octave can be a freely available program with a language mostly works with MATLAB : /software/octave/.
Scilab is often a scientific program for numerical computations inside a user-friendly environment. It is fully open source and possesses a parallel version. /.
IDL Interactive Data Language can be a commercial computer software with applications much like MATLAB. It is very like minded to image processing and 3D visualization. IDL was formerly manufactured by Research Systems Inc., now a part of IIT Visual Information Solutions
Igor Pro is usually a commercial graphing, data analysis, image processing and programming computer software that combines extensive programmability and numerical analysis tools with powerful visualization tools.
O-Matrix is really a commercial MATLAB - like program. In fact it possesses a MATLAB compatibility mode, how the authors claim can execute native MATLAB code 5-10 times faster than MATLAB. Readers who may have used this package ought to send me a more in depth explanation.
LyME runs a good subset of MATLAB code within the Palm platform. Available for free at Thanks to Martin Cohen because of this info.
Fredrik Hekland suggests: Back from the days when I used OS/2, Euler would have been a good replacement MATLAB at the very least for the simple operations I needed in those days. I see that Euler remains living, now as GNU GPLed OSS. /MGF/homes/grothman/euler/
Stefan Mueller is associated with developing a MATLAB - like program called JMathLib, coded in Java. See /.
SciPy and NumPy are open source Python packages for scientific computations.
FreeMat looks very comparable to MATLAB, however it is open source. It runs under Linux, Mac OS X and Windows as well as the newest version 4.0 premiered 2009-10-09. /
A cell is often a flexible form of variable that may hold any form of variable. A cell array is actually an variety of those cells. Its somewhat confusing so lets make an analogy. A cell is like a bucket. You can throw whatever you decide and want to the bucket: a string, an integer, a double, a variety, a structure, even another cell array. Now lets say you've got an assortment of buckets - numerous cells or maybe a Cell Array. Each bucket can contain different things, or some may all offer the same sort of variable. Bucket 1 could possess a string, while bucket 2 could contain an image assortment of uint8s, while bucket 3 can be quite a int32. Or all buckets could contain strings of several lengths. Its totally flexible.
ca1 myString; ca2 myInteger; ca3 myDoubleArray; ca4 rgbImage; ca5 myStructure;
The braces needs to be read as belongings in, if you say ca4 rgbImage, you happen to be saying that this content of cell 4 may be the variable rgbImage.
Another strategy to use the cell is usually to refer for the cell itself, rather than the belongings in it, along with that you employ parentheses. The item it identifies must be a cell. For example ca1 can be a cell, ca2 can be a cell, and ca3 is often a cell, although those cells contain variables of arbitrary, and maybe different, types. To make something a cell, you enclose it in braces, such as this:
This number of code is entirely comparable to the first list of code. For the initial line, its basically like saying Lets obtain a bucket a cell and set the string engrossed - thats what myString alone is. Then lets take that bucket and earn it bucket 1, replacing any bucket that had been already there. In other words, grab the cell myString and produce it be element 1 bucket 1 on the cell array called ca. It uses parentheses which implies it is the term for the whole single bucket the bucket in addition to the contents even though the first group of code used braces which is the term for only the contents in the bucket. So ca1 equals the cell myString, while ca1 equals the string myString considering that the braces said to obtain the contents in the cell. In other words, ca1 says dont supply the bucket with all the string inside, just deliver the string alone, without worrying about bucket. Its merely a slight difference - a somewhat different method of considering it. Saying
are equivalent with the most part. You can use in any event and I dont really think a proven way or the other is basically preferred. You will use whatever approach is easier for someone to think about it. Maybe one way will probably be more intuitive for you personally than the other way, nevertheless, they may be equivalent.
Cell arrays are much like structures, you probably are definitely more familiar with, in this both are containers which could hold variables of the variety of various sorts arrays, strings, scalars, even other structures or cells. The difference is the fact with structures you consider the different members or fields by their name , while with cells you consider them by their index number ca1.
Here is a demo code that can help explain cell arrays, plus the type of classes you receive when you make use of braces or parentheses:
Initialize a cell array with three differing kinds of contents. % First cell contains an int32, second cell includes a string, % and also the third cell has a double array. ca int32123, abcdef, piones3 % Lets see whats in cell 1 and also the difference between % using and ultizing. ca1cell ca1 fprintfnThe class of ca1cell is %sn, classca1cell ca1contents ca1 fprintfThe class of ca1contents is %snn, classca1contents % Lets see whats in cell 2 as well as the difference between % using and utilizing. ca2cell ca2 fprintfThe class of ca2cell is %sn, classca2cell ca2contents ca2 fprintfThe class of ca2contents is %snn, classca2contents % Lets see whats in cell 3 and also the difference between % using and utilizing. ca3cell ca3 fprintfnThe class of ca3cell is %sn, classca3cell ca3contents ca3 fprintfThe class of ca3contents is %snn, classca3contents % Now lets see what gets displayed when we utilize % celldisp function specially designed for displaying cells: fprintfnHere is exactly what celldisp returns:n celldispca;
One utilization of cell arrays is usually to hold lists of strings of various lengths. Since arrays are rectangular, you cant produce an character variety of strings unless each string was exactly the same length or padded with blanks to get as long because the longest string. To get around that, you may use a cell array instead of any character array. Each cell inside the cell array would hold a string of an different length - it shouldn't have to all be a similar length like that has a character array. For example:
ca Short; A little longer; A really really long string
If you receive strange error messages while working together with cells or cell arrays, one simple thing to try is always to change your braces into parentheses, or perhaps your parentheses into braces, and pay attention to if that eliminates the errors.
Its also possible to blend indexing in the row and column with the cell array while using indexing with the contents on the single cell during that row and column with the cell array. For example, lets build a cell range of 2 rows and 3 columns, plus every cell of their lets put a 4 element integer array. Then well access the next element in the integer array on the cell in row 1, column 2 on the cell array.
Create jail cell selection of 2 rows and 3 columns. % Each element inside array can be a single cell. rows 2; columns 3; c cellrows, columns; % Now, per cell from the cell array, % put numerous 4 random integers inside range 1-99. for column 1: columns for row 1 : rows randomNumberArray randi99, 1, 4; crow, column randomNumberArray; % An alternate technique of specifying is given within the next line. %crow, column randomNumberArray; % Note adjustments to braces and parentheses. fprintfThe integer array in row %d, column %d with the cell array row, column, randomNumberArray1, randomNumberArray2, randomNumberArray3, randomNumberArray4; end end % Print out the next element on the 4-element integer array % on the cell in the 1, 2 position within your 2D variety of cells. ourValue c1, 22 fprintfThe second element in the integer array in cell row %d, column %d row, column, ourValue;
To visualize, imagine you had several buckets arranged by two rows and 3 columns this can be our cell array, plus in each bucket are 4 billiard balls arranged in the line. The above example goes toward the bucket in the primary row and second column, and reads from the number on the second billard ball for the reason that bucket.
It doesnt. It uses full double-precision floating point numbers to calculate everything. By default it only prints a number of decimal places to your screen. You can change this utilizing the command:
When performing linear algebra operations on complex matrices, in most cases the complex conjugate transpose also referred to as the Hermitian transpose that's needed see Gilbert Strangs linear algebra book for discussion- page 293 in edition 3. The bare apostrophe is definitely an operator that may the complex conjugate transpose. The non-conjugating transpose operator is usually a period accompanied by an apostrophe. Type help punct to learn more.
is not add up to any number, not even
itself. Therefore there's 2 ways to detect
tends for being 20%-30% faster. Heres the test snippet if you wish to see the comparison:
In R12 MATLAB 6.0, this could be controlled using a preference. Select the File menu item, and select Command Window from the Preferences dialog that appears. In the Display section, theres a checkbox labeled Limit matrix display width to eighty columns. Unchecking that box allows matrix displays to create full use from the Command Windows width. Unchecked would be the default.
Starting with MATLAB R12.1, users can access the present command window size while using root property CommandWindowSize. That is,
szget0, CommandWindowSize;
In R12.0, there is no strategy to do this if you don't call undocumented C functions from your MEX file.
Starting in MATLAB 7 R14, the syntax is:
You could also highlight an area of code and type control-r to comment your code - this will likely place a percent symbol % for the beginning with the line. Typing control-t will uncomment the lines by removing any percent symbol that could be the first non-blank character about the line.
If you could have an older version, the built-in editor in MATLAB 6.0 incorporates a block-comment feature, that will simply put a comment character on each line. Or you may use matlab-mode for Emacs, which assists this at the same time.
If you might be using an even older version, take advantage of this:
This is not the most beneficial solution, since parse errors inside that block causes an error.
The key is usually to create a startup.m file. Look in the online help for more descriptive instructions specific in your operating system.
You can make use of the following one-line function to discover the indices on the local maxima.
If you've the Image Processing Toolbox, you may use the imregionalmax function. If you've the Signal Processing Toolbox you'll be able to use the findpeaks function.
You could possibly have used an adjustable called i earlier as part of your program or session, thus overwriting the imaginary constant i with your own personal number. In this example, MATLAB make use of your new value for i as opposed to treating i as sqrt-1. Five methods to ensure that you obtain a complex result are:
Use the syntax 6i; MATLAB always interprets this as 6sqrt-1
Note: these are generally very good advantages for not using i j as indexes in FOR loops, for instance
Easiest solution: utilize the PATHTOOL GUI. Or if you desire command line access:
Suggested by Joshua Stiff: You are able to use addpath to include directories in the command line, and path2rc to write the latest path returning to pathdef.m. If you do not have write permissions for pathdef.m, path2rc can write to some other file, which you may execute from the startup.m.
R14 - Matlab 7.0 - MCR 7.0 - compiler 4.0 - R14SP1 - Matlab 7.0.1 - MCR 7.1 - compiler 4.1 - R14SP2 - Matlab 7.0.4 - MCR 7.2 - compiler 4.2 - R14SP3 - Matlab 7.1 - MCR 7.3 - compiler 4.3 - R2006a - Matlab 7.2 - MCR 7.4 - compiler 4.4 - R2006b - Matlab 7.3 - MCR 7.5 - compiler 4.5 - R2007a - Matlab 7.4 - MCR 7.6 - compiler 4.6 - R2007b - Matlab 7.5 - MCR 7.7 - compiler 4.7 - R2008a - Matlab 7.6 - MCR 7.8 - compiler 4.8 - R2008b - Matlab 7.7 - MCR 7.9 - compiler 4.9 - R2009a - Matlab 7.8 - MCR 7.10 - compiler 4.10 - R2009b - Matlab 7.9 - MCR 7.11 - compiler 4.11 - R2009bSP1 - Matlab 7.9.1 - MCR 7.12 - compiler 4.12 - R2010a - Matlab 7.10 - MCR 7.13 - compiler 4.13 - R2010b - Matlab 7.11 - MCR 7.14 - compiler 4.14 - R2011a - Matlab 7.12 - MCR 7.15 - compiler 4.15 - R2011b - Matlab 7.13 - MCR 7.16 - compiler 4.16 - R2012a - Matlab 7.14 - MCR 7.17 - compiler 4.17 -
You might have multiple functions defined in a single m-file, and you cant employ a script accompanied by one or more functions in the identical m-file. For example, this m-file:
This may be the m-file called test.m, composed of any script as well as a function. % It will generate an oversight. clc; % Clear the command window. m magic7; MyCustomFunctionm % Define a custom function inside m-file function MyCustomFunctionm dispm;
Error: File: test.m Line: 8 Column: 1 Function definitions are certainly not permitted within this context
because lines 1-5 really are a script, and 7-9 certainly are a function. To fix, include a function line as the primary line inside your code after any comments as well as work. See below:
This would be the m-file called test.m made up of two functions. function test clc; % Clear the command window. m magic7; MyCustomFunctionm % Define a custom function inside the m-file function MyCustomFunctionm dispm;
If you no longer need that function line, its a script, and also you cant then define functions later further down inside your code. By adding that line, material making a function out in the first few script lines inside your m-file, and once all code is within functions, there's no error.
Please dont try this! You will find that MATLAB arrays either numeric or cell allows you to do the identical thing in a very much faster, additional readable way. For example, if A1 through A10 contain scalars, use:
A zeros1, 10; % Not necessary, just faster for i1:10 Ai % some equation end
Now reference Ai if you mean Ai. In case each Ai includes a vector or matrix, each that has a different size, you wish to use cell arrays, that are intended exactly because of this:
Note that all Ai boasts a different size matrix. And be careful to utilize the curly braces for that subscript!
Another solution to have your cake and eat it too is to apply structures rather then cell arrays. The fields with the structure is most likely the variable names you would like. And you are able to index into all of them dynamic field references. For example:
names fred sam al; for ind 1:lengthnames s.namesind magiclengthnamesind; end
In this situation, you end up together with the variable s, a structure, containing fields specified by the strings stored from the cell array names.
Now, in case you still really need to create variables with dynamically generated names, you need to make use of EVAL. With EVAL, you utilize MATLAB commands to build the string which will perform the operation you want. For example, evalA10 has precisely the same effect as A10, and evalA B 10 has precisely the same effect as AB10, exactly the EVAL method executes considerably more slowly. So in the loop, make use of:
Notice how a lot more obfuscated it is. In addition, this tends to cause difficult-to-troubleshoot problems inside your code, particularly in the event you try to dynamically produce a variable while using same name like a function:
Calling this function with y mysin1 is not going to return y 5 the initial element with the sin variable produced by EVAL - - it's going to return the sine of just one, because in the event the function was parsed there was clearly no variable named sin so the usage of sin for the last line was parsed being a call for the built-in SIN function. The fact that an adjustable named sin existed at runtime is irrelevant; the parsetime decision takes precedence.
Repeat: dont create variables at runtime using EVAL unless you've got a great reason, for instance someone provides a MAT file with 2000 variables named A1428, by way of example. Even because case, you are able to avoid EVAL:
Assume the MAT-file contains 2000 variables, A1 through A2000 S ; % S is actually a struct array with 2000 fields, S.A1 through S.A2000. % To access A1428, use: x1 S.A1428; % If the index in the variable you desire to access is stored in the variable: k 1428; x2 S.sprintfA%d, k; x3 S.A, num2strk;
If the files that you wish to process are sequentially numbered, like, , , etc. then it is possible to use SPRINTF or NUM2STR to produce the filename and LOAD, IMREAD, FOPEN, etc. to retrieve the data on the file. Also note these different ways of building the file name - you are able to use your selected way.
Read files through, through, % and through Files are inside the current directory. % Use fullfile in the event you need to prepend a few other folder for the base file name. % Adapt to utilize which ever cases you would like. for k 1:20 % Create a mat filename, and load it in a structure called matData. matFileName, k; if existmatFileName, file matData loadmatFileName; else fprintfFile %s isn't going to exist.n, matFileName; end % Create a perception filename, and focus it in to an adjustable called imageData. jpgFileName strcatimage, num2strk, ; if existjpgFileName, file imageData imreadjpgFileName; else fprintfFile %s won't exist.n, jpgFileName; end % Create a text file name, and look the file. textFileName file num2strk ; if existtextFileName, file fid fopentextFileName, rt; textData freadfid; fclosefid; else fprintfFile %s will not exist.n, textFileName; end end
In the above mentioned code, matData, imageData, and textData could possibly get overwritten whenever. You should save them to a wide range or cell array when you need to utilize them beyond your loop, otherwise have used them immediately in the loop.
The second method is in order to process each of the files whose name matches a pattern within a directory. You can makes use of the DIR function to return a directory of all file names matching the pattern, for instance files or files, or all files named where nnnn is really a number. Note that even if this example uses because the pattern and IMREAD to read within the data, as together with the previous example you can actually use whatever pattern and file reading function suits your applications needs:
Specify the folder in which the files live. myFolder C:UsersyourUserNameDocumentsMy Pictures; % Check to ensure that that folder actually exists. Warn user whether it doesnt. if isdirmyFolder errorMessage sprintfError: The following folder doesn't exist:n%s, myFolder; uiwaitwarndlgerrorMessage; return; end % Get a summary of all files inside the folder together with the desired file name pattern. filePattern fullfilemyFolder, ; % Change to whatever pattern you may need. theFiles dirfilePattern; for k 1 : lengththeFiles baseFileName ; fullFileName fullfilemyFolder, baseFileName; fprintf1, Now reading %sn, fullFileName; % Now do whatever you want using this type of file name, % including reading it in for an image array with imread imageArray imreadfullFileName; imshowimageArray; % Display image. drawnow; % Force display to update immediately. end
Or you'll be able to use the more, though quite a bit less robust, code inspired from this StackOverflow question:
csvfiles for file csvfiles fprintf1, Doing something end
The simplistic code above assumes that every files will likely be in the actual folder. Or you may try a File Exchange Pick from the Week: FileFun.
In MATLAB all array indices need to be logical or positive numeric integers. This means that this is permitted:
A3.14159 % 3.14159 just isn't an integer Subscript indices must either be real positive integers or logicals.
A0 Subscript indices must either be real positive integers or logicals.