plotting in a for loop

Question

Christopher 2013-6-3

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/77778-plotting-in-a-for-loop

Hello, I am trying to plot in a while loop and I am having trouble figuring out how to set this up. I am calling a function that I have written to vary the x component of the vector from -20 to 20 in increments of 5. The code for the function and the file I am using are shown below.

Code:
x1=-1;
y1=0;
z1=0;
x2=1;
y2=0;
z2=0;
x=-25;
y=5;
z=0;
while x<20 
    x=x+5
  vortexsegment(x1,y1,z1,x2,y2,z2,x,y,z);
  end
Function:
  function[Vx,Vy,Vz]=vortexsegment(x1,y1,z1,x2,y2,z2,x,y,z);
S=[x1,y1,z1];  % defining points for start
E=[x2,y2,z2];  % defining points for end
R=[x,y,z];     % defining points for point of interst
A=S-R;  % Finding vector a
B=E-R;  % Finding vector b
Z1=cross(A,B);
Z2=dot(A,B);
MagA=norm(A);
MagB=norm(B);
q=(Z1./(dot(Z1,Z1))).*(MagA+MagB).*(1-(Z2./(MagA.*MagB)));
V=(1./(4.*3.14)).*q
Vx=V(1,1)
Vy=V(1,2)
Vz=V(1,3)

Thanks

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Answer 1

Image Analyst 2013-6-3

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/77778-plotting-in-a-for-loop#answer_87468

在 MATLAB Online 中打开

Did you try to plot Vx?

while x < 20 
  x=x+5
  [Vx, Vy, Vz] = vortexsegment(x1,y1,z1,x2,y2,z2,x,y,z);
  plot(Vx, 'b-', 'LineWidth', 3);
  grid on;
  drawnow;
end

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Christopher 2013-6-3

That seems to do the trick. Thank you! What is it called when you use [Vx, Vy, Vz] = vortexsegment(x1,y1...etc)? I haven't seen that before? I am still somewhat of a newb with matlab.

Thanks again

Image Analyst 2013-6-3

That's called accepting the return arguments into variables in the calling routine, or something like that. vortexsegment() calculates them and sends them back to the caller, but unless the calling routine accepts them into variables, they are thrown away.

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