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how to remove Error using contour (line 48) Z must be at least a 2x2 matrix to plot contour lines

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Selam Dagne
Selam Dagne 2019-4-2
回答： Cris LaPierre 2019-4-3
I need to plot contour lines but I have got the error Error using contour (line 48) Z must be at least a 2x2 matrix.So what is the problem and how can i solve it.The code is given below.
dt=1e-6;
v1=11:0.2:16;
v2=250:10:450;
[V1,V2] = meshgrid(v1,v2);
L=18.7e-6;
IP=(sum(V1-n.*V2.^2).*dt)/L ;
contour(V1,V2,rms(Ip))

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Cris LaPierre
Cris LaPierre 2019-4-3
The error is that the third input to countour (Z) must be a matrix. This doc link describes what the inputs to contour must be.
To at least get something plotted, try this.
n=.4;
dt=1e-6;
v1=11:0.2:16;
v2=250:10:450;
[V1,V2] = meshgrid(v1,v2);
L=18.7e-6;
IP=((V1-n.*V2.^2).*dt)/L ;
contour(V1,V2,IP)
I made IP a matrix by removing the sum and rms commands.

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