The short answer: the built-in function arrayfun does exactly what your map function does for numeric arrays: >> y = arrayfun(@(x) x^2, 1:10) y = 1 4 9 16 25 36 49 64 81 100 There are two other built-in functions that behave similarly: cellfun (which operates on elements of cell arrays) and structfun (which … Read more
You can get the idea by running other versions of your code. Consider explicitly writing out the computations, instead of using a function in your loop tic Soln3 = ones(T, N); for t = 1:T for n = 1:N Soln3(t, n) = 3*x(t, n)^2 + 2*x(t, n) – 1; end end toc Time to compute … Read more
The single ampersand & is the logical AND operator. The double ampersand && is again a logical AND operator that employs short-circuiting behaviour. Short-circuiting just means the second operand (right hand side) is evaluated only when the result is not fully determined by the first operand (left hand side) A & B (A and B … Read more
I guess the following code could do the trick: strs = {‘HA’ ‘KU’ ‘LA’ ‘MA’ ‘TATA’} ind=find(ismember(strs,’KU’)) This returns ans = 2
Many built-in operations like sum and prod are already able to operate across rows or columns, so you may be able to refactor the function you are applying to take advantage of this. If that’s not a viable option, one way to do it is to collect the rows or columns into cells using mat2cell … Read more
Here is a much better (official) NumPy for Matlab Users link – I’m afraid the mathesaurus one is quite out of date. The numpy equivalent of repmat(a, m, n) is tile(a, (m, n)). This works with multiple dimensions and gives a similar result to matlab. (Numpy gives a 3d output array as you would expect … Read more
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