# 3d plot with x value being constant

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Darren Marcelino am 13 Dez. 2022
Kommentiert: Darren Marcelino am 20 Jan. 2023
im trying to plot a point on a 3d plot but i keep coming up with the error
Error using plot3
Vectors must be the same length.
Error in threed_suspension (line 50)
plot3(Lowerx,Lowery,Lowerz,'b')
I dont know how to keep p5x constant while p5y and p5z a changing variable.
p5y(i)= RL*cosd(LowerTheta(i));
p5z(i)=RL*sind(LowerTheta(i)); %parallel
z=size(LowerTheta);
p5x= p1x*z;
Lowerx=[p1x,p5x];
Lowery=[p1y,p5y(i)];
Lowerz=[p1y,p5z(i)];
plot3(Lowerx,Lowery,Lowerz,'b')
plot3(p5x,p5y,p5z,'*r')
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### Akzeptierte Antwort

Askic V am 13 Dez. 2022
p5x= p1x*ones(z);
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Askic V am 13 Dez. 2022
Did you try this?
%p5 lower arm member
p5y(i)= RL*cosd(LowerTheta(i));
p5z(i)=RL*sind(LowerTheta(i)); %parallel
p5x(i) = p1x;
Lowerx=[p1x,p5x(i)];
Lowery=[p1y,p5y(i)];
Lowerz=[p1y,p5z(i)];
I'm not really sure what you want to do, but if you need p5x to be constant, just assign it value just like on y and z component.
Darren Marcelino am 20 Jan. 2023
I ended up figuring that spherical coordinates are easier to manipulate and keep stuff constant. i rewrote my code using spherical coordinates. i found it easier. i had to do extra trig to figure out angles but i found that if you are trying to keep a length constant, one end of it is pinned. (360 freedom of movement) , and the other end is moving in the 3d space, spehrical coordinates are best to use.
https://www.mathworks.com/help/phased/ug/spherical-coordinates.html

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