Hello! How to make for loop for cycle calculation using previous coordinates to calculate next one, etc

Question

Aknur 2022-10-13

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1825428-hello-how-to-make-for-loop-for-cycle-calculation-using-previous-coordinates-to-calculate-next-one

编辑： Aknur 2022-11-7

Hello! I am trying to apply for loop. I have x0, y0, z0 coordinates and wrote a function to calculate next x1, y1, z1

I need to make for loop and the previous calculated result of x1, y1, z1 will be considered for the next cycle ( instead of x0, y0, z0) and so on (x2, y2, z2 will , number of cycle will be 5. I tried to do it. Could you please help me with my code. Thank you in advance

function [x1, y1, z1, F] = reflection(x0,y0,z0, Theta, Phi)

disp(x1);

disp(y1);

disp(z1);

disp(F);

end

And here is my for loop attempt

x0 = 1.5;

y0 = 1.5;

z0 = 3.0;

for ii=1:10

r1 = 1i;

r2 = 1i + 1;

reflection(x(ii), y(ii), z(ii));

end

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Dyuman Joshi 2022-10-13

在 MATLAB Online 中打开

You can call the function in a loop -

x0 = [1.5 zeros(1,10)];
y0 = [1.5 zeros(1,10)];
z0 = [3.0 zeros(1,10)];
for ii=2:11
    r1 = 1i;
    r2 = 1i + 1;
    [x0(ii),y0(ii),z0(ii),~]=reflection(x0(ii-1), y0(ii-1), z0(ii-1));
end

However, the function requires 5 inputs, of which 2 are missing from the function call above (Theta, Phi)

Also, what is the significance of r1 and r2 in the for loop?

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Answer 1

David Hill 2022-10-13

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1825428-hello-how-to-make-for-loop-for-cycle-calculation-using-previous-coordinates-to-calculate-next-one#answer_1074128

在 MATLAB Online 中打开

H,d,A,B,E,F are all constant, therefore your could do all iterations at once.

[x,y,z]=reflection(1.5,1.5,3,60,45,5)
x = 1×5
    5.1742    8.8485   12.5227   16.1969   19.8712
y = 1×5
    5.1742    8.8485   12.5227   16.1969   19.8712
z = 1×5
   -4.3485  -11.6969  -19.0454  -26.3939  -33.7423
function [x, y, z] = reflection(x,y,z, Theta, Phi,n)%n=number of iterations
 n=1:n;
 H =  3;
 d = H /cos(Theta);
 A = (sind(Theta)* H)/cosd(Theta); 
 B = (sind(Phi)* sind(Theta)* H)/cosd(Theta);
 E = cosd(Phi) * sind(Theta)* H/cosd(Theta);
 F = (sind(Theta) * H/cosd(Theta))/sind(Phi);
 x = x + n*B;
 y = y + n*E;
 z = z - n*F;
end