Need help with "??? Undefined function or variable 'limit_2'. The first assignment to a local variable determines its class."

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Alex Damaratski 2020-3-31

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https://ww2.mathworks.cn/matlabcentral/answers/514234-need-help-with-undefined-function-or-variable-limit_2-the-first-assignment-to-a-local-variab

评论： Alex Damaratski 2020-4-4

采纳的回答： Athul Prakash

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Hello everyone. I have a task to create a programm with mex file but now i faced with diffuculties.

I entered my function and code.

I need to generate matrix, then find the sum in the whole matrix across the limit that i need to define and I need to change the numbers in the limit with the sum

This is my function

function [a, b, c] = fun(A, limit_1, limit_2)
sum = 0;
b = 0;
c = 0;
r = size (A);
a = A;            
r_1 = r(1);       %%количество строк
r_2 = r(2);       %%количество толбцов
for i = limit_1:(limit_2)
    sum = sum + a(i);
end
for i = 1:limit_1-1
    a(i) = sum;
end
for i = (limit_2+1):r_1 * r_2
    a(i) = sum;
end
end

This is the code

limit_1 = input ("Vvedite levyi limit = ");
limit_2 = input ("Vvedite pravyi limit = ");
A=ones(1,10);
B=ones(1,10);
for i = 1000:1000:10000
x = randi([-5,5],i,i);
tic
a = fun(A, limit_1, limit_2);
vrema=toc;
A(1,i/1000)=vrema;
codegen fun -args {zeros(i,i),1} -nargout 3
tic
a = fun_mex(A, limit_1, limit_2);
vremb=toc;
B(1,i/1000)=vremb;
end
iks=1000:1000:10000;
plot(iks,A,'-square','MarkerIndices',1:length(A))
 hold on
 plot(iks,B,'-square','MarkerIndices',1:length(B))
 legend('matlab-func','mex-func','Location','northwest')
 xlabel('Size matrix')
 ylabel('Time')