How to plot this function with 2 variables?

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Marisa
Marisa 2023-10-30
移动：Dyuman Joshi 2023-10-30
Hello, I’m having a hard time plotting z2(t). I keep getting the error “input must be a function or functions of a single variable”. I’m not sure how to properly define “u”.
  2 个评论
Dyuman Joshi
Dyuman Joshi 2023-10-30
移动：Dyuman Joshi 2023-10-30
As you are using fplot, the expected input is a function handle.
And the syntax to define a function handle is
name_of_handle = @(independent_variables) relation_or_expression_of_independent_variables
%For the first example, it translates to
z1 = @(t) exp(t);
Refer to these links for more information -
https://in.mathworks.com/help/matlab/ref/function_handle.html
https://in.mathworks.com/help/matlab/matlab_prog/anonymous-functions.html

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回答（1 个）

Voss
Voss 2023-10-30
Ran in:
t = -2:0.01:2;
z1 = exp(t);
z2 = 2*(t+1 >= 0);
z3 = 0.5*sin(7*t);
hold on
grid on
plot(t,z1,'-','LineWidth',2)
plot(t,z2,':','LineWidth',2)
plot(t,z3,'--','LineWidth',2)
xlabel('t')
ylabel('z')
legend("z"+[1 2 3])
ylim([-1 8])
  9 个评论
显示 7更早的评论
Sam Chak
Sam Chak 2023-10-30
Hi @Marisa
In the mathematical representation of linear physical systems (later in your course), you may encounter the state-space equation, . But this is not the unit step function. Please keep that in mind.

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