How do I set an initial value for an input in a MATLAB Function Block in Simulink?

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This is the function description.
function Y = fcn(U)
Y=U*2;
I want to set intial value for U at the start of simulation. I am unable to set initial value in the function block data editor.
Below is the simulink model:

Accepted Answer

Fangjun Jiang
Fangjun Jiang on 21 Feb 2020
The initial value of "U" is determined by the 1/z block. Set the initial value there.

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