How to generate the equations automatically for multiple number of times

Question

Farhan 2015-5-10

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/216045-how-to-generate-the-equations-automatically-for-multiple-number-of-times

评论： Farhan 2015-5-11

Hello,

I want to generate these 4 equations (written below) multiple times,(V11, delta11, I11, phi11, V21,delta21,I21,Phi21 are measurements) For each sample of these 8 measurements i want to generate 4 more equations automatically.

e.g. if no of samples= 3, then i need to generate 12 equations automatically

Can anyone suggest a smarter way of doing that?

Thanks in advance! Farhan

    F = [V11.*cos(delta11) - R1*I11.*cos(phi11)+X1*I11.*sin(phi11)-E3.*cos(delta31)+R3*I31.*cos(phi31)-X3*I31.*sin(phi31)
     V11.*sin(delta11) - R1*I11.*sin(phi11)-X1*I11.*cos(phi11)-E3.*sin(delta31)+R3*I31.*sin(phi31)-X3*I31.*cos(phi31)
     V21.*cos(delta21) - R2*I21.*cos(phi21)+X2*I21.*sin(phi21)-E3.*cos(delta31)+R3*I31.*cos(phi31)-X3*I31.*sin(phi31)
     V21.*sin(delta21) - R2*I21.*sin(phi11)-X2*I21.*cos(phi11)-E3.*sin(delta31)+R3*I31.*sin(phi31)-X3*I31.*cos(phi31)]

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Answer 1

Image Analyst 2015-5-10

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/216045-how-to-generate-the-equations-automatically-for-multiple-number-of-times#answer_178571

在 MATLAB Online 中打开

Why not write a function:

function F = GenerateF(V11, delta11, I11, phi11, V21,delta21,I21,Phi21)
F = [V11.*cos(delta11) - R1*I11.*cos(phi11)+X1*I11.*sin(phi11)-E3.*cos(delta31)+R3*I31.*cos(phi31)-X3*I31.*sin(phi31)
     V11.*sin(delta11) - R1*I11.*sin(phi11)-X1*I11.*cos(phi11)-E3.*sin(delta31)+R3*I31.*sin(phi31)-X3*I31.*cos(phi31)
     V21.*cos(delta21) - R2*I21.*cos(phi21)+X2*I21.*sin(phi21)-E3.*cos(delta31)+R3*I31.*cos(phi31)-X3*I31.*sin(phi31)
     V21.*sin(delta21) - R2*I21.*sin(phi11)-X2*I21.*cos(phi11)-E3.*sin(delta31)+R3*I31.*sin(phi31)-X3*I31.*cos(phi31)]

Then just call the function whenever you need to with whatever inputs you have at the time.

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Walter Roberson 2015-5-10

在 MATLAB Online 中打开

function F = GenerateF(V11, delta11, I11, phi11, V21,delta21,I21,Phi21)
    F = @(R1, R2, R3, X1, X2, X3, E3) [V11.*cos(delta11) - R1*I11.*cos(phi11)+X1*I11.*sin(phi11)-E3.*cos(delta31)+R3*I31.*cos(phi31)-X3*I31.*sin(phi31)
         V11.*sin(delta11) - R1*I11.*sin(phi11)-X1*I11.*cos(phi11)-E3.*sin(delta31)+R3*I31.*sin(phi31)-X3*I31.*cos(phi31)
         V21.*cos(delta21) - R2*I21.*cos(phi21)+X2*I21.*sin(phi21)-E3.*cos(delta31)+R3*I31.*cos(phi31)-X3*I31.*sin(phi31)
         V21.*sin(delta21) - R2*I21.*sin(phi11)-X2*I21.*cos(phi11)-E3.*sin(delta31)+R3*I31.*sin(phi31)-X3*I31.*cos(phi31)];

The return value will be a function in R1, R2, R3, X1, X2, X3, E3, that will have "bound in" the values of the parameters that you passed to the generating function.

Farhan 2015-5-11

Hi Image Analyst,

All the inputs to GenereateF i.e. V11, delta11, I11, phi11, V21,delta21,I21,Phi21 are my measurement data. In order to solve these equations generated by GenerateF using (non-linear least square) algorithm one need at least 3 samples of input data.(No of Eqs>No of unknowns)

Therefore 4*3=12 eqs i want to first generate these 12 equations automatically and then will be used in least square algorithm. (other option is to write by hand, but imagine if no of samples = 10, so i cant write 40 equations manually)

Any suggestion how to generate multiple no of equations (for loop may be, but my V11, delta11.... are changing (due to next sample of data) )

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