Is there a way to find slope at any point on the graph?
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I have plotted a graph (I-V curve of transistor) and I need to find slope at various points as encircled. What is the way to do so? Thanks, Kany
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Star Strider
on 9 Apr 2015
The easiest way is to use the gradient function. (I believe you forgot to upload your plot, but that doesn’t affect my Answer.)
If you then want the slope at particular values of your x-variable, use the find function to detect the indices of those values, then use the indices to find the value of the gradient at those values.
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Star Strider
on 9 Apr 2015
If you have constant, equal spacing of your independent variable, gradient is preferable. If you have unequal independent variable spacing, diff may be more accurate in some situations.
However, you can convert unequal spacing to equal spacing with the interp1 function. So it would likely be easier and more accurate to define equally-spaced independent variable values and interpolate their corresponding dependent variable values with interp1 and use gradient for the derivative, remembering to define the independent variable constant spacing interval in your call to gradient.
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