Changing values of axis

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Alexander Engman 2018-5-18

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评论： Alexander Engman 2018-5-21

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Hi!

I have a plot such as in the attached image. As you can see, the y-axis values range from 1E-7 - 10E-7. I would like to rescale it so that it ranges from simply 0.1-1. How would I do that?

Thanks in advance.

Alexander

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Answer 1

Sandro Lecci 2018-5-18

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Hi Alexander,

To change the limits of the axis do the following:

set(gca, 'YLim', [0.1,1])

However, your data will not be displayed as they are smaller than the lower limit (0.1). You would want to multiply them by a specific factor, such as *1E6 ?

Best, Sandro

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Alexander Engman 2018-5-21

Hi Sandro,

thank you for your answer. The problem is that the plot is a contour plot, meaning my function depends on both the variable on the y-axis and the x-axis. So the values on the y-axis are predetermined and MATLAB formats the axis values automatically. I understand the point behind the formatting but for my purpose it is not ideal. Any ideas?

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Answer 2

Walter Roberson 2018-5-21

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You can set the axes YTickLabels to whatever you want, including to strings that have nothing to do with the actual Y values.

You can use mat2gray() or the new rescale() to change the y values to your desired range before you plot them.

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Alexander Engman 2018-5-21

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Thank you Walter. I found an easy solution. I though that multiplying the axis in the contour plot would change the plot values, but of course it doesnt. I just multiplied the y-axis values by 10E6 and then plotted on the appropriate scale.

[C,h]=contour(Vfvecq, rvecq*10^6, OPTq,'Color','k');

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