Matlab Invalid Data Argument
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u = @(t) (t>=0);
r = @(t) t.*u;
x = @(t) r(t)-r(t-1)-3*u(t-1)-2*r(t-3)-r(t-4)-r(t-5)-u(t-7);
t = [-2:0.01:7];
plot(t,x)
Why am a getting invalid data argument as error when plotting>
[SL: formatted code as code]
回答（2 个）
Steven Lord
2020-10-16
Let's look at your code section by section.
u = @(t) (t>=0);
r = @(t) t.*u;
This will not work as written. You cannot multiply a number and a function handle. What you can do instead is to multiply a number and the result of evaluating a function handle.
r = @(t) t.*u(t);
In the next section there is a similar problem.
x = @(t) r(t)-r(t-1)-3*u(t-1)-2*r(t-3)-r(t-4)-r(t-5)-u(t-7);
t = [-2:0.01:7];
plot(t,x)
The plot function will not accept a function handle as its second input, but it can accept the result of evaluating a function handle.
plot(t, x(t))
Karolis Poskus
2020-10-16
Hello,
To plot anonymous function use:
doc fplot
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