Why can't I use fplot command ?

t= -2:0.001:4;
x_t= (50.*exp(-3.82.*t)).*heaviside(t);
h_t= (25.*t.*exp(-1.91*t)).*heaviside(t);
fplot(x_t,t)

Error: Error using fplot (line 145)

Invalid parameter '-2 ...'.

Can you explain why am I getting this error ?

Answer 1

[the cyclist]

fplot expects a function as input. I think you want the plot command instead, which expects numerical vector input ...

plot(x_t,t)