Unrecognized function or variable 'uu'. Error in 'TBSv1/desired trajectory' while evaluating expression.

I have a block taking input as only time, but the error keeps poping up,

• Unrecognized function or variable 'uu'.
• Error in 'TBSv1/desired trajectory' while evaluating expression.

How to solve this error? My code works fine if i use Matlab function instead of integrated matlab function.

here is the code in the block for reference

function out=DesiredTrajectory(uu,P)
t=uu;
ytraj= [8;8;20];
ydottraj= [0;0;0];
yddottraj= [0;0;0];
out=[...
    ytraj;...
    ydottraj;...
    yddottraj];

[Walter Roberson]

Your MATLAB Function Block in Simulink does not have at least one input signal.

[Twinkle Patel]

the input here is just the time from the clock, any suggestion?

[Walter Roberson]

What is the other input, P ?

Is it correct that your actual code ignores t after setting it, and ignores P, and always emits that 9 x 1 matrix?

[Twinkle Patel]

P is just the parameter, well the "t" here is there to be used for some cases like below

if t > 20
ytraj= [5 ; 10 ; 5];
ydottraj= [0;0;0];
yddottraj= [0;0;0];
end

[Walter Roberson]

Please attach your model for testing.

Answer 1

[Mara]

If you call this function, you need two inputs inside the bracket:

out = DesiredTrajectory(uu, P)

It sounds to me like you might have uu in your workspace, so the code runs fine when you evaluate the selection. But when you call a function, it does not have access to that. It only has access to the variables that you give it as an input, in this case uu and P.

Maybe try to check it. Put a breakpoint at the line t = uu and see if uu appears in the workspace.

Hope I could help!

[Twinkle Patel]

it does not even go to the breakpoint it stops even before that showing the error, it still does not work

[Mara]

Alright, I am sorry but I cannot help you with this. As far as I understood, the problem is not the function but the code from where you call it. I wish you good luck

[Twinkle Patel]

no problem,thanks!