Hello, I have a problem with for loops and plotting the lines.

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Daniil Rulev
Daniil Rulev 2016-1-27
回答： Naga 2024-10-23，6:34
Good afternoon colleques,
I have a question, I need to plot 181 lines from +90° to -90° using for loop. I have tried this (but it seems to be wrong):
for i=0:1:181 angle=i; for k=1:200
x2(k)=k*cos(angle);
x1(k)=0;
y1(k)=0;
y2(k)=k*sin(angle);
plot(x1,y1,x2,y2)
end
end
As a results it plots only one line, instead of 181 on different angles.
Looking forward to your answers and suggestions and thank you in advance.

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回答（1 个）

Naga
Naga 2024-10-23，6:34
Ran in:
Hello Daniil,
To plot 181 lines from +90° to -90° using a for loop, you can use the following code. It calculates the starting and ending points of each line based on the angles, then plots them on the same graph. The hold on command ensures all lines are displayed together. Here’s the code:
angles = 90:-1:-90;
linecoord = [0, 1];
for angle = angles
x = cosd(angle) * linecoord;
y = sind(angle) * linecoord;
plot(x, y);
hold on;
end

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