simulink error related to diff of a vector

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pemfir 2013-5-15

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https://ww2.mathworks.cn/matlabcentral/answers/75879-simulink-error-related-to-diff-of-a-vector

I am using a function block in simulink. suppose "score" is a vector of size [1000 1]. i store the index of the maximum value in score in ind3 : [~, ind3] = max(score); I know that the initial value of ind3 = 1. Then i want to store something like: storing = sum(diff(score(1,1:ind3)).^2), which will be the output of the function block. But, i keep getting error message related to variable matrix sizes such as

SUM with one variable-size matrix input of [] is not supported. Block MATLAB Function2 (#100) While executing: none

I have noticed that i do not get any error if i use something like storing = sum(diff(score(1,1:100)).^2) but as soon as i put ind3, i get the errors.

Thank you

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pemfir 2013-5-15

Another error i get : The working dimension was selected automatically, is variable-length, and has length 1 at run-time. This is not supported. Manually select the working dimension by supplying the DIM argument.

pemfir 2013-5-16