Is it my equation wrong? Cause I get a weird graph for this equation.

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Muhammad Harriz Bin Zamri
回答： Voss 2022-6-2
Ran in:
clear; clc;
syms t;
f=exp(-2*t)*tanh(4*t);
c=0.000009;
I=c*diff(f);
figure(1); fplot(I); grid; xlabel('time'); ylabel('current'); title('current vs time');

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采纳的回答

Voss
Voss 2022-6-2
Ran in:
If the current is given by that function of time i(t), and you should plot the current vs time, then there is no need to do c*diff(f) (not for part A anyway).
Also, specify a time interval in fplot that starts at 0.
syms t; I=exp(-2*t)*tanh(4*t); %c=0.000009; I=c*diff(f);
figure(1); fplot(I,[0 5]); grid; xlabel('time'); ylabel('current'); title('current vs time');

更多回答（2 个）

Sam Chak
Sam Chak 2022-6-2
Hi @Muhammad Harriz Bin Zamri
Missing dot.
t = 0:0.01:5;
x = exp(-2*t).*tanh(4*t);
plot(t, x, 'linewidth', 1.5)
xlabel('t')
ylabel('i(t)')
grid on
Image Analyst
Image Analyst 2022-6-2
Ran in:
You may need to specify a time vector rather than use syms. Like
t = linspace(0, 5, 500);
f=exp(-2*t).*tanh(4*t);
c=0.000009;
I=c*diff(f);
figure(1);
plot(t(2:end), I, 'b-', 'LineWidth', 2);
grid;
xlabel('time');
ylabel('current');
title('current vs time');

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