Plotting a an equation as function of radius .

2020 7 4
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更新时间：2020 7 4
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I want to plot ,
utheta= -k*ln(ro/r)
where k=10 and ro=1000
for angle theta = pi/2 and theta = 3*pi/2 only where theta is measured from negative y axis.
How do I plot this. I am not getting , please help me.

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回答（1 个）

KSSV
KSSV 2020-7-4

0 个投票

t = linspace(pi/2,3*pi/2) ;
k = 10 ; r0 = 1000 ;
r = r0*exp(t/k) ; % on solving the give equation for r
plot(t,r)

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utheta is a separate function of r . and theta is not varying . I need the plot only for theta equal to pi/2 and theta =3*pi/2.
KSSV
KSSV 2020-7-4
Do you have ranges of utheta and r? Have a look on ezplot. https://in.mathworks.com/help/matlab/ref/ezplot.html
no range for theta. utheta is a function of r only.
KSSV
KSSV 2020-7-4
utheta and theta are same right?
no utheta is a dispalcement in theta direction which is a function of r only.

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