How do I plot velocity after differentiating displacement with respect to time?

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Matthew Roper
Matthew Roper 2017-2-1
回答： Star Strider 2017-2-1
I have successfully managed to differentiate displacement to find velocity. However, i am then unable to plot a figure of velocity versus time, or differentiate again to find acceleration, as the vectors are of different sizes.
How can I fix this?
Thanks.

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Star Strider
Star Strider 2017-2-1
use the gradient function for the numerical derivative, not diff. (Use del2/4 for the second derivative.) The diff function does successive differences, so the output is one element shorter than the input. The gradient function is a numerical derivative function, so the output will be the same length as the input. See the documentation for the various functions for details.

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