You could use a colormap such as HSV to generate a set of colors. For example: cc=hsv(12); figure; hold on; for i=1:12 plot([0 1],[0 i],’color’,cc(i,:)); end MATLAB has 13 different named colormaps (‘doc colormap’ lists them all). Another option for plotting lines in different colors is to use the LineStyleOrder property; see Defining the Color … Read more
With MATLAB Version 7.9 (R2009b) you can use a ~, e.g., [~, ~, variableThatIWillUse] = myFunction(); Note that the , isn’t optional. Just typing [~ ~ var] will not work, and will throw an error. See the release notes for details.
A command like this runs the m-file successfully: “C:\<a long path here>\matlab.exe” -nodisplay -nosplash -nodesktop -r “run(‘C:\<a long path here>\mfile.m’); exit;”
There isn’t a direct way to do this like you’ve attempted. The usual approach is to use “varargs” and check against the number of arguments. Something like: function f(arg1, arg2, arg3) if nargin < 3 arg3 = ‘some default’ end end There are a few fancier things you can do with isempty, etc., and you … Read more
Can you use R to replace MATLAB? Yes. I used MATLAB for years but switched primarily to R in the last 3 years. At this point, they have much more in common than not. It partially depends on your field and use-case. And as Spencer Graves said previously, it also depends on which “church you … Read more
Because i and j are both functions denoting the imaginary unit: http://www.mathworks.co.uk/help/matlab/ref/i.html http://www.mathworks.co.uk/help/matlab/ref/j.html So a variable called i or j will override them, potentially silently breaking code that does complex maths. Possible solutions include using ii and jj as loop variables instead, or using 1i whenever i is required to represent the imaginary unit.
I’ve been working with OO MATLAB for a while, and ended up looking at similar performance issues. The short answer is: yes, MATLAB’s OOP is kind of slow. There is substantial method call overhead, higher than mainstream OO languages, and there’s not much you can do about it. Part of the reason may be that … Read more
MATLAB’s FOR loop is static in nature; you cannot modify the loop variable between iterations, unlike the for(initialization;condition;increment) loop structure in other languages. This means that the following code always prints 1, 2, 3, 4, 5 regardless of the value of B. A = 1:5; for i = A A = B; disp(i); end If … Read more
Use the class function: >> b = 2 b = 2 >> a=”Hi” a = Hi >> class(b) ans = double >> class(a) ans = char
The first function in an m-file (i.e. the main function), is invoked when that m-file is called. It is not required that the main function have the same name as the m-file, but for clarity it should. When the function and file name differ, the file name must be used to call the main function. … Read more