Problem 651. Functional inputs
Return an n-dimensional array whose elements are the results of a function over a set of vectors.
The (i,j,k, ...n)th element of the output matrix is the results of executing the function on the ith element of the first vector, jth element of the second, and so forth. The function will be passed in, accepts n arguments, and returns a single number.
For example, if the function is:
minus12 = @(a) a(1)-a(2);
and the inputs are:
as = [1 3 5 7]; bs = [0 1 2 3 4];
then the output would be:
>> gridit(minus12, as, bs) ans = 1 0 -1 -2 -3 3 2 1 0 -1 5 4 3 2 1 7 6 5 4 3
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I'd like to include the test case listed below, but I'm stumped as to why it doesn't work:
%%
x1 = [ 1 2 3 ]
x2 = [ 10 20 ]
y_correct = [9 19; 8 18; 7 17]
y_actual = gridit(@minus, x1, x2);
assert(isequal(y_actual, y_correct));
Alex, I believe it is because the 'minus' function requires two input arguments. The test cases and the example use functions that accept a single input argument. Hope that helps.
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