I try this coding but it's say plot error..what wrong with my coding?

clear; clc;

syms t; f=exp(t)*sin(3*t); diff (f) c=0.003; I=c*diff(f);

figure; plot(t,I); grid; xlabel('time'); ylabel('current'); title('current vs time');

Answer 1

[Dyuman Joshi]

Use fplot to plot symbolic expressions

syms t
f=exp(t)*sin(3*t); 
c=0.003; I=c*diff(f);
figure; 
fplot(I);
grid;
xlabel('time'); ylabel('current'); title('current vs time');