# How to plot a derivative against variable?

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Use if statements to select an equation for x based on the inputed value for damping. Plot a graph of x (displacement) against time (this bit works). Then want to differentiate x for velocity, and differentiate velocity for acceleration and then plot all three. I used:

syms t

v = diff(x,1)

plot(t,v)

Get error "Data must be numeric, datetime, duration, categorical, or an array convertible to double."

x is a previously selected equation with t as a variable, also includes Z but this is asked for and inputted at the beginning.

##### 2 Comments

### Accepted Answer

Walter Roberson
on 1 Apr 2023

Change

t = (0.0:0.001:5);

to

syms t

Change

plot(t,x,'b')

to

fplot(x, [0 5])

change

plot(t, v)

to

fplot(v, [0 5])

### More Answers (1)

Peter Perkins
on 5 Apr 2023

##### 0 Comments

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