I am trying to plot a function based on different x-axis values. The code is displayed in the body below. The error displayed by the compiler is also shown below the code.

code :

" function P = volt_ind_cell(U)
%#codegen

P = zeros(19172, 12);
a := 0:
b := 0:

for a from 1 to 19172 step 1 do
    for b from 1 to 12 step 1 do
        if U(a,b) < 3.5 then
            P(a,b) = 2.48 * [(U-3) * (U-3)];
        else
            P(a,b) = 0.877 * [(sqrt(U-3))];
        end
    end
end "

error :

"Unexpected MATLAB expression.

Function 'MATLAB Function' (#47.86.87), line 8, column 7: "f" Launch diagnostic report. Component: MATLAB Function | Category: Coder error"

Apparently the error is in the first line wherein 'for a' loop has been declared.

Please let me know the reason for this failure. Thanks