Undefined function or variable 'dct'

I'm trying to convert matlab code to C by using Matlab Coder. I got attached error message, "Undefined function or variable 'dct'." It's weird, because dct belongs to Matlab Coder supported function list in https://kr.mathworks.com/help/coder/ug/functions-supported-for-code-generation-alphabetical-list.html

Please explain why Matlab Coder cannot find dct function, and how to solve it. Thanks.

Answer 1

[Stephan]

Did you take notice of the limitations for code generation for dct function?

Usage notes and limitations:

C and C++ code generation for dct requires DSP System Toolbox™ software.

The length of the transform dimension must be a power of two. If specified, the pad or truncation value must be constant. Expressions or variables are allowed if their values do not change.

Also try:

which dct

That command should give a path back in which the function is installed.

If there is no result type:

ver

to find out what toolboxes are licensed and installed on your machine.

Signal Processing Toolbox and DSP System Toolbox should be part of the list.

I would expect you find the reason for your problem in one of these steps.

Best regards

Stephan