How to do this kind of contour plot?

Question

Juan Castillo 2018-5-9

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https://ww2.mathworks.cn/matlabcentral/answers/399910-how-to-do-this-kind-of-contour-plot

评论： jonas 2018-5-15

采纳的回答： jonas

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I just want to plot a graph like this:

I know it's a contour plot, but I don't know how to do it.

I wanna plot several curves (as shown in the figure) vs another parameter, for example:

Curve 1: X-Axis --> Voltage | Y-Axis --> Current | For T = 10ºC
Curve 2: X-Axis --> Voltage | Y-Axis --> Current | For T = 20ºC
Curve 3: X-Axis --> Voltage | Y-Axis --> Current | For T = 40ºC
Curve 4: X-Axis --> Voltage | Y-Axis --> Current | For T = 60ºC
Curve 5: X-Axis --> Voltage | Y-Axis --> Current | For T = 80ºC

Somebody could help me? Thanks in advance.

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KSSV 2018-5-9

contour is the one you need. What problem you have?

Juan Castillo 2018-5-9

Hi, thanks for your help.

Please read my last comment for more info.

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Answer 1

jonas 2018-5-9

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Basically you don't define data along lines but rather on a full rectangular grid. Let's say you want to plot data between x=0:10 and y=0:10.

x=0:10;
y=0:10;
[X,Y]=meshgrid(x,y)

This will give you a grid (11x11). Now define the function Z(Y,X) which you want to plot. For example:

Z=X.^2+Y.^2
[C,h]=contour(X,Y,Z)

You can also define the number of contours as a fourth argument. Finally, you can label the contours by adding:

clabel(C,h)

Hope this helps

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Juan Castillo 2018-5-10

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Exactly. That's what I wanna plot.

For example. The dimensions are:

Curve 1. Tº = 20ºC

X-Axis: Voltage

0
0,02
0,04
0,06
0,08
0,1
0,12
0,14
0,16
0,18
0,2
0,22
0,24
0,26
0,28
0,3
0,32
0,34
0,36
0,38
0,4
0,42
0,44
0,46
0,48
0,5
0,52
0,54
0,56
0,58
0,6
0,62
0,64
0,66
0,68
0,7
0,72
0,74
0,76
0,78
0,8
0,82
0,84
0,86
0,88
0,9
0,92
0,94
0,96
0,98
1
0,98
0,96
0,94
0,92
0,9
0,88
0,86
0,84
0,82
0,8
0,78
0,76
0,74
0,72
0,7
0,68
0,66
0,64
0,62
0,6
0,58
0,56
0,54
0,52
0,5
0,48
0,46
0,44
0,42
0,4
0,38
0,36
0,34
0,32
0,3
0,28
0,26
0,24
0,22
0,2
0,18
0,16
0,14
0,12
0,1
0,08
0,06
0,04
0,02
0

Y-Axis: Current measured

Curve 2. Tº = 40ºC

X-Axis --> Same

Y-Axis --> Same with another values

And so on. All the curves have the same dimensions.

Thanks again for your patience.

jonas 2018-5-15

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Hi again, sorry for the late reply. Based on the comments, what you want is an ordinary plot, like this:

h=plot(x,y1,...
x,y2,...
x,y3) %and so on

You can also add labels using text. Adding a colorbar to a 2d-plot is not as trivial, but it can be done by setting the line colors based on a colormap and a temperature vector, or alternatively by using something like this non-default function 3d color line (link)

This will not give you a plot identical to the one in your figure, which I believe is a surface plot (with data on a full rectangular grid). If you want to obtain similar results, then there are some different solutions. To be honest, having both colors AND clabels (as in the figure) is however unnecessary. Anyway, let me know if you still want that.

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