how could i use the while statement more faster

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ahmed hattab 2012-7-21

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https://ww2.mathworks.cn/matlabcentral/answers/44197-how-could-i-use-the-while-statement-more-faster

if any one please could help me with this. I'm making a loop using while statement , but it took too much time. is there is any way to reduce the needed time ?

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Jan 2012-7-21

It is impossible to suggest an improvement without seeing the code. Please add it to the question by editing.

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Answer 1

George Papazafeiropoulos 2012-7-21

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https://ww2.mathworks.cn/matlabcentral/answers/44197-how-could-i-use-the-while-statement-more-faster#answer_54215

What do you want to do exactly inside this while loop? Can you show some piece of code?

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ahmed hattab 2012-7-21

在 MATLAB Online 中打开

well with this code i'm tryinf to find the solution of 2 equations in 2 variaples

the first equation is Mcc+Mct+Ms-M= 0 the seconed one Cc-Cct-Ts=0

the first variple is eps and the second one is x

i know there is a way to solve equations directly in matlap but these equations are a little complicated so when i try to solve them they give no ansewer.I try to do that using "solve" and "fmin" both of them fails to find the solution so i tried numirically. What is starnge that the same code i made in VBA and it works very fast, i don't know whay Matlab take so much time

here is the code

ep1=0;

ep2=epult;

eps=(ep1+ep2)/2;

x1 = 0;

x2 =h;

x = (x1+x2)/2;

run('C:\hattab\hattab\master of scince\my master\matlab\using matricies\Force.m');

while abs(Mcc+Mcct+Ms-M)/M>eqTol

 if Mcc+Ms+Mcct-M>0 
        ep1=ep1;
        ep2=eps;
        eps=(ep1+ep2)/2;
    else
        ep1=eps;
        ep2=ep2;
        eps=(ep1+ep2)/2;
    end
        x1 = 0;
        x2 =h;
        x = (x1+x2)/2;
        run('C:\hattab\hattab\master of scince\my master\matlab\using matricies\Force.m');
        while abs(Cc-Ts-Cct)/Cc >eqTol 
            if Cc-Ts-Cct>0 
                x1=x1;
                x2=x;
                x=(x1+x2)/2;
                % clac force 
                 run('C:\hattab\hattab\master of scince\my master\matlab\using matricies\Force.m');
            else
                x2=x2;
                x1=x;
                x=(x1+x2)/2;
                % clac force 
                run('C:\hattab\hattab\master of scince\my master\matlab\using matricies\Force.m');
            end
        end

end

thanks for your effort

Jan 2012-7-21

Do not overwrite the built-in function eps with a local variable.

Add the folder "C:\hattab\hattab\master of scince\my master\matlab\using matricies\" to the path (see e.g. addpath) and call the script Force directly without the run command. It would even better to convert Force to a function.

ahmed hattab 2012-7-21

it works thanks very much for your help

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how could i use the while statement more faster

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how could i use the while statement more faster

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