3plot won't give a three-dimensional plot

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Aram Cornelis
Aram Cornelis 2017-5-15
回答： KL 2017-5-15
So I am trying to get a three dimensional plot with pressure (p) on the x-, volume (V) on the y- and temperature (Temp) on the z-axis. My code looks like this:
if true
% code
function pressure=func()
% Constantes
R_g=287
L=36.74e-3 %m
r=8.5e-3 %m
theta=[0:0.1*pi:2*pi] %rad
S=2*r %m
d=30e-3 %m
h=1.9e-3 %m
V_cl=(0.25*pi*d.^2)*h
p_atm=1.013e5 %Pa
p_out=1e6 %Pa
kappa=1.35
mcomp=1.2 %kg
mexp=1 %kg
% Dependent Variables
V1=V_cl+(0.25*pi*(d^2))*S %m^3
V2=V1*(p_atm/p_out).^(1/kappa) %m^3
V3=V_cl %m^3
V4=V3*(p_out/p_atm).^(1/kappa) %m^3
Vcomp=[V2:1e-7:V1] %m^3
Vexp=[V3:1e-7:V4] %m^3
function compression=f(Vcomp)
compression=(p_atm.*(V1).^kappa)./((Vcomp).^kappa) %Pa
end
function expansion=g(Vexp)
expansion=(p_out.*(V3).^kappa)./((Vexp).^kappa) %PA
end
Traject1=@f
pcomp=f(Vcomp)
Traject2=@g
pexp=g(Vexp)
%Temperature
function temperature=temp(p,V,m)
temperature=(p.*V)/(m*R_g)
end
Temp1=@temp
Tcomp=temp(pcomp,Vcomp,mcomp)
Temp2=@temp
Texp=temp(pexp,mexp,mexp)
%Graphics
hold on
plot3(Vcomp,pcomp,Tcomp,'red')
plot3(Vexp,pexp,Texp,'green')
hold off
end
end
When I run this, I get no errors yet it only gives me a 2D plot (a pV-diagram). What is going wrong here?

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回答（2 个）

KSSV
KSSV 2017-5-15
Your plot is 3D plot only......you need to change the orientation of the plot. Two ways..
1. doc view
2. There would be a rotation icon in the plot, click on it and rotate.
KL
KL 2017-5-15
Change your function to have the desired variables as outputs, like this
function [Vcomp,pcomp,Tcomp, Vexp,pexp,Texp]=func() %very first line of your code
then you can call the funtion and plot it like this
>> [a,b,c,a1,b1,c1] = func();
>> plot3(a,b,c)
>> hold on
>> plot3(a1,b1,c1)

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