# How to know about the co-ordinates of a point in a MATLAB plot

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tina jain on 26 May 2015
Edited: Walter Roberson on 26 May 2015
how to know about the value of intersection point .
Let it be blue line, now I want to know the value at y when value of x is 0.025
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Star Strider on 26 May 2015
Use the green and brown picture icon to attach your .png file.
tina jain on 26 May 2015
done....

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### Answers (1)

Star Strider on 26 May 2015
Edited: Star Strider on 26 May 2015
Use the interp1 function:
yi = interp1(x, y, 0.025, 'linear','extrap');
assuming that ‘x’ and ‘y’ are the data that define your blue line, ‘yi’ will be the value of ‘y’ where x=0.025.
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