problem with workspace matlab 2020b

Question

ataberk kaplica 2020-12-5

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/680468-problem-with-workspace-matlab-2020b

评论： ataberk kaplica 2020-12-6

采纳的回答： Walter Roberson

I have a problem with workspace ı can not see variables while code is working perfectly also ı can not see any plotting

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Answer 1

Walter Roberson 2020-12-5

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https://ww2.mathworks.cn/matlabcentral/answers/680468-problem-with-workspace-matlab-2020b#answer_566558

The code you posted is a function. Local variables for a function disappear after the function returns; you would have to put in a breakpoint before the end of the function to see the local variables.

Your posted code does not plot anything.

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ataberk kaplica 2020-12-5

在 MATLAB Online 中打开

function GaussSeidel
close all
clear all
n=10;
for i1=1:n
     b(i1)=i1
     for j1=1:n
         a(i1,j1)=((i1*(-1)^j1)/70 +(j1*(-1)^i1)/50);
     end 
     sumvalue=0;
     for j1=1:i1-1
         sumvalue=sumvalue+abs(a(i1,j1));
     end
     for j1=i1+1:n
        sumvalue=sumvalue+abs(a(i1,j1));
     end
     a(i1,i1)=sumvalue;
end 
b=transpose(b);
Detofa=det(a)
eigenvalueofa=eig(a);
conditionnumberofa=max(abs(eigenvalueofa))/min(abs(eigenvalueofa))
inverseofa=inv(a);
Xinv=inverseofa*b;
error=a*Xinv-b;
L2error=sqrt(transpose(error)*error);
for i1=1:n
    X(i1)=1.0;
end
X=transpose(X);
L2errors=0.01
L2errora=1.0
iter=0;
lambda=0.4;
while L2errora>L2errors
    iter=iter+1;
    Xprevious=X;
    for i1=1:10
        sumvalue=0;
        for j1=1:i1-1
            sumvalue=sumvalue+a(i1,j1)*X(j1);
        end
        for j1=i1+1:n
            sumvalue=sumvalue+a(i1,j1)*X(j1);
        end 
        x(i1)=(b(i1)-sumvalue)/a(i1,i1);
    end 
    errora=(X-Xprevious)./X*100;
    X=lambda*X+(1-lambda)*Xprevious;
    L2errora=sqrt(transpose(errora)*errora);
    errorvector(iter)=L2errora;
    continue 
end 
figure
semilogy(errorvector,"-ro",...
    "LineWidth",2,...
    "MarkedSize",10,...
    "MarkedEdgeColor",
"b")
title("error")
xlabel("iteration")
ylabel("l2error")

* ı mention about this code , in course same code with teacher but he can see the plots but ı can not see any thing , there is no error also

Walter Roberson 2020-12-6

在 MATLAB Online 中打开

x(i1)=(b(i1)-sumvalue)/a(i1,i1);

That is the only place in the code that you use lower-case x as a variable name.

semilogy(errorvector,"-ro",...
    "LineWidth",2,...
    "MarkedSize",10,...
    "MarkedEdgeColor",
"b")

That needs a few changes:

semilogy(errorvector, "-ro",...
    "LineWidth", 2,...
    "MarkerSize", 10,...
    "MarkerEdgeColor", "b")

ataberk kaplica 2020-12-6

thank you man ,I really appreciated you're support.

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problem with workspace matlab 2020b

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