# How can I convert double to const real_T of a sfunction?

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Alexander Nass il 7 Feb 2018
Risposto: Benjamin Thompson il 10 Ott 2022
Hi everyone :) ,
I am working on my Masters and have a C-code which I have to put into a sfunction for SIMULINK. As an in between result I have a value of an variable of datatype double (fx_u). With it other values have to be calculated also, which will be output of the sfunction in SIMULINK as well.
For that I have to convert the double to real_T, haven´t I? (real_T as output data type of a sfunction) How can I do that?
Code is something like:
for(i = 0; i <= limit; i++)
{
fx_u[i] = x0 + x1*u + x2*(u*u) + x3*(u*u*u) + x4*(u*u*u*u) + x5*(u*u*u*u*u);
u = u+res;
}
x = &fx_u; // <<--- I MEAN THIS LINE BECAUSE I GET A WARNING WHICH IS:
"warning: assignment from incompatible pointer type x = &fx_u;"
x is of data type real_T and fx_u is of data type double. x should be the output and fx_u is meant for further calculations.
Please don´t beat me, I am still a student.
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fus il 26 Apr 2022
Did you ever find a solution for this? Running into the same problem and google is not being my friend

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### Risposte (1)

Benjamin Thompson il 10 Ott 2022
If x is a constant you cannot change it. You would need to supply a more complete example, it is hard to tell what you are trying to do.
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