MATLAB: Generate code from ‘pchip’ function

code generation of pchipmatlab coderpchip code

Hi ,

i would like to generate c code of the interpolating function 'pchip'. I tested that function with coder.screener and it says it's ready for code generation. But when i build pchip.m file i get the error:

"The function 'pchip' is not supported for standalone code generation. See the documentation for coder.extrinsic to learn how you can use this function in simulation."

Pease can anyone help me ? i really need this function for a program i'm writing. i'm using matlab r2013a.

thanks in advance.

Best Answer

Code generation support for PCHIP and other interpolation routines were added in R2014a if you are able to upgrade:

http://www.mathworks.com/help/coder/release-notes.html

See the bullet labelled:

 Code generation for fminsearch optimization function and additional interpolation functions in MATLAB

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MATLAB: Smoothing Spline C/C++ Code Generation Support

Hi Sravan,

The curve fitting toolbox does not support code generation. However, the interpolation capabilities in core MATLAB do. Look at spline, interp1, smoothdata, ppval, et al.

MATLAB: Pchip extrapolation

your extrapolating quite far (compared to the source data), plot the data and you will see why the numbers are not what "you expect" - extrapolation must always be treated with care.

x = -3:3; 
y = [-1 -1 -1 0 1 1 1]; 
t = -3:.01:3; 
plot ( [-5:0.01:5], pchip(x,y,[-5:0.01:5]), 'r' );
hold on; 
y = [-1 -0.98 -0.94 0 0.94 0.98 1]; 
plot ( [-5:0.01:5], pchip(x,y,[-5:0.01:5]), 'k' );
grid on

Best Answer

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MATLAB: Smoothing Spline C/C++ Code Generation Support

MATLAB: Pchip extrapolation

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