Passing a constant function handle to another function
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I want to pass a constant function handle "simulate" to a function "fftest", so that the corresponding function in the function handle simulate is called during evaluation "fftest" with the provided arguments:
simulate = @depsim;
g = @(x,y) fftest(x,y,@simulate);
g(1,1);
% in separate files:
function ret = depsim(a,b)
ret = ones(a,b);
end
function fftest(a,b,simulate)
disp(simulate(a,b));
disp("it works!");
end
I get the following exception, when I run the code:
Not enough input arguments.
Error in depsim (line 3)
ret = ones(a,b)
Error in test (line 28)
simulate = depsim;
I do not understand what the problem is, do I need to pass the handle differently?
采纳的回答
Steven Lord
2022-2-6
What appears in the error message is not what appears in the code you posted. First a comment about the code you posted:
simulate = @depsim;
g = @(x,y) fftest(x,y,@simulate);
As written this is probably not going to work. The first line defines a variable named simulate that contains a function handle. The second line treats simulate as a function and creates a function handle to it. If you wanted to pass the variable you created on the first line into fftest get rid of the second @ in the second line.
simulate = @depsim;
g = @(x,y) fftest(x,y,simulate);
Now from the error message:
Error in test (line 28)
simulate = depsim;
This does not have anything to do with function handles. This attempts to call the depsim function with 0 inputs and assign 1 output from that function call to the variable simulate. If you intended this to create a function handle to depsim, you need the @ before the function name.
simulate = @depsim;
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