Skipping outputs with anonymous function in MATLAB

anonymous-function, matlab

Solution

There's no way I know of within the expression of the anonymous function to have it select which output to return from a function with multiple possible output arguments. However, you can return multiple outputs when you evaluate the anonymous function. Here's an example using the function MAX:

>> data = [1 3 2 5 4];  %# Sample data
>> fcn = @(x) max(x);   %# An anonymous function with multiple possible outputs
>> [maxValue,maxIndex] = fcn(data)  %# Get two outputs when evaluating fcn

maxValue =

     5         %# The maximum value (output 1 from max)


maxIndex =

     4         %# The index of the maximum value (output 2 from max)

Also, the best way to handle the specific example you give above is to actually just use the function handle `@ttest2` as the input to CELLFUN, then get the multiple outputs from CELLFUN itself:

[junk,probabilities] = cellfun(@ttest2,cellArray1,cellArray2);

On newer versions of MATLAB, you can replace the variable `junk` with `~` to ignore the first output argument.

Problem

Say I want to create an anonymous function from a m-file-function that returns two outputs. Is it possible to set up the anonymous function such that it only returns the second output from the m-file-function? Example: `ttest2` returns two outputs, t/f and a probability. If I want to use the t-test with `cellfun`, I might only be interested in collecting the probabilities, i.e. I'd like to write something like this ``` probabilities = cellfun(@(u,v)ttest2(u,v)%take only second output%,cellArray1,cellArray2) ```

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