simulink function block error: Function output 'y' cannot be an mxArray in this context.
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i am dealing with a function block in simulink, trying to calculate the interval of a signal with variable frequency to get the real time frequency. My thought is to use tic/toc get the interval between two peaks.
So confused by this error. The diagnostic says:
Function output 'y' cannot be an mxArray in this context. Consider preinitializing the output variable with a known type. Function 'MATLAB Function1' (#312.9.10), line 1, column 10: "y" Launch diagnostic report.
Simulink cannot determine sizes and/or types of the outputs for block 'signalTimer/MATLAB Function1' due to errors in the block body, or limitations of the underlying analysis. The errors might be inaccurate. Fix the indicated errors, or explicitly specify sizes and/or types for all block outputs.
function y = timer(u)
persistent x1 x2
x1 = 0;
x2 = 0;