TLC FEVAL() function returns 0 always HELP!

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Xenoepist 2012-9-12

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https://ww2.mathworks.cn/matlabcentral/answers/47997-tlc-feval-function-returns-0-always-help

评论： Sameer 2014-10-15

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(Note: I took the "A" variable out to simplify the problem, so is not used for now.)

I'm trying the following TLC code:

%function Outputs(block, system) Output
%assign rollVars = ["U", "Y"]
%roll idx = RollRegions, lcv = RollThreshold, block, "Roller", rollVars
    %assign A = LibBlockInputSignal(0,"",lcv,idx) %%Constant Amplitude
    %assign t = LibBlockInputSignal(1,"",lcv,idx) %%Time from Simulink clock block
    %assign x = 1.5708                            %%Test Variable
    %<LibBlockOutputSignal(0, "", lcv, idx)> = %<FEVAL("sin", t)>;
%endroll
%endfunction

But the output of FEVAL returns zero when I use a parameter from "LibBlockInputSignal()"... so the following formats for FEVAL return zero

%<FEVAL("sin", t)>, %<FEVAL("cos", t)>,
%<FEVAL("sin", A)>, %<FEVAL("cos", A)>

However, when I try %<FEVAL("sin", x)>, it returns the actual sine of x. (in this case x = pi/2 so it returns 1)

Also, if I set the variable "t" as an output (instead of FEVAL), I can see the time on the Simulink model scope block. So I know the variable "t" is holding the simulation run time as a double.

I am really confused on why this happens. Any help would be appreciated