How I can fix my problem when I add a function to the main script within for loop and run iteration was made with an error?

Question

Aknur 2023-3-26

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https://ww2.mathworks.cn/matlabcentral/answers/1935604-how-i-can-fix-my-problem-when-i-add-a-function-to-the-main-script-within-for-loop-and-run-iteration

评论： Aknur 2023-4-1

Hello! Kindly ask help in function and running through main script

I wanted to combine all. I have one function which is 'planeLocation7' and going to call it in the main script with a loop.

function [XBar, YBar, ZBar, p, Xr, Yr, Zr, ThetaBar, PhiBar, Rr] = planeLocation7(X0, Y0, Z0, Theta0, Phi0)

When I am running through the main script code makes for loop but shows me only one result for k=1, and for the other k shows 0, NaN, etc. Seems like I made mistake with inputs and zeros(1:k).

In planeLocation7 I calculate all data and then Xr, Yr, Zr, TheBar, PhiBar will be considered as X0, Y0, Z0, Theta0, Phi0 for the next iteration. Before I had two functions and the main, and it worked, but after I added a formula to calculate XBar, YBar, ZBar to the 'planeLocation7' function the main script does not work properly. Kindly ask for help

here is my main script.

clc
clear all
close all
X0 = 1.5;
Y0 = 1.5;
Z0 = 3.0;
Theta0 = 30;
Phi0 = 90;
K = 5;
X = [X0 zeros(1,K)];
Y = [Y0 zeros(1,K)];
Z = [Z0 zeros(1,K)];
Theta = [Theta0 zeros(1,K)];
Phi = [Phi0 zeros(1,K)];
for i = 1:K
    i
    X = [X0 zeros(1,K)];
    Y = [Y0 zeros(1,K)];
    Z = [Z0 zeros(1,K)];
    Theta = [Theta0 zeros(1,K)];
    Phi = [Phi0 zeros(1,K)];
    
    
    [XBar, YBar, ZBar, p, Xr, Yr, Zr, ThetaBar, PhiBar, Rr] = planeLocation7(X(i), Y(i), Z(i),Theta(i), Phi(i));
    
    X(i+1) = Xr;
    Y(i+1) = Yr;
    Z(i+1) = Zr;             
    Theta(i+1) = ThetaBar;
    Phi(i+1) = PhiBar;
    
end 
fprintf('X(%d)=%f\n', i, X(i));
fprintf('Y(%d)=%f\n', i, Y(i));
fprintf('Z(%d)=%f\n', i, Z(i));
fprintf('Theta(%d)=%f\n', i, Theta(i));
fprintf('Phi(%d)=%f\n', i, Phi(i));
disp("===");

Thank you in advance for your consideration

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Walter Roberson 2023-3-26

What do you expect planeLocation7 to return when you pass in 0 for all parameters?

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Answer 1

Walter Roberson 2023-3-26

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1935604-how-i-can-fix-my-problem-when-i-add-a-function-to-the-main-script-within-for-loop-and-run-iteration#answer_1201379

在 MATLAB Online 中打开

for i = 1:K
    i
    X = [X0 zeros(1,K)];

You overwrite all of X each iteration of for i

X(i+1) = Xr;

You overwrite one element of X near the end of the loop. But the next iteration, you overwrite all of X, so the stored value will be lost -- except on the very last iteration.