function coder.newtype not supported for code genertion

Hello friends,

Matlab coder asked me to make a input variable (for a function) as constant by using newtype.

After I did it, it says that the coder.newtype is not supported.

Anyone?

Thanks

Answer 1

[Ryan Livingston]

Can you elaborate on where you used coder.newtype? If using the codegen command you can:

codegen myFunction -args {coder.typeof(1,[10,20],[0,1])}

To pass a constant input use:

codegen myFunction -args {coder.Constant(magic(3))}

Lastly, can you copy and paste the exact error message you're getting? It seems like something we could improve.

[Tamar Harpaz]

First, thanks.

This is the error :Function 'typeof' not supported for code generation.

This is a peace of the code: ( the last line is the error line)

Thanks

function [stim]=createHRTF(angle)


%load 'ReferenceHRTF.mat' hrtfData sourcePosition

hrtfDB= load ('ReferenceHRTF.mat');
hrtfData=hrtfDB.hrtfData;
sourcePosition=hrtfDB.sourcePosition;

hrtfData = permute(double(hrtfData),[2,3,1]);

sourcePosition = sourcePosition(:,[1,2]);

% 344-360 left 0-90Right

desiredAz =0;
desiredEl = 0;
if angle<0
    angle=360+angle;
end

angle=double(angle);

desiredAz = desiredAz+angle;
desiredPosition = [angle 0];

leftChannelVec=[];
rightChannelVec=[];

fileReader = dsp.AudioFileReader('C:\Users\User\Downloads\createHRTF\stim.wav');
deviceWriter = audioDeviceWriter('SampleRate',fileReader.SampleRate);
interpolatedIR  = interpolateHRTF(hrtfData,sourcePosition,desiredPosition);
leftIR = squeeze(interpolatedIR(:,1,:))';
rightIR = squeeze(interpolatedIR(:,2,:))';

y = dsp.FIRFilter('Numerator',coder.Constant('constant', leftIR));

[Ryan Livingston]

Got it. The issue is the call to coder.Constant. That is meant to be used as an input to codegen not in your MATLAB code. For example:

codegen myFunction -args {coder.Constant(1), otherArg}

If you'd like to forcibly constant fold something inside your MATLAB code, you should instead use coder.const

function y = foo()
y = coder.const(svd(magic(30)));
end

[Tamar Harpaz]

Thanks

but still error with "The input to coder.const cannot be reduced to a constant." for the same line

[Ryan Livingston]

For coder.const to succeed, the input to it must be able to have a constant value computed for it. Look back through your code to find the variables that lead to the value of leftIR. Test each one of those with coder.const to find the root value which is non-constant.

Glancing over the code it looks like one of the dependencies leads to load. The output of load is never constant. You can instead try coder.load which always produces a constant value rather than load which is a runtime value.

[Tamar Harpaz]

Thanks again.

I implemented your advice.

but a little problem for that 2 first lines:

hrtfDB= load ('ReferenceHRTF.mat');

hrtfData=coder.const(hrtfDB.hrtfData);

The output of a call to 'load' is not assigned to a variable. Assign its output to a variable without subscripting when adding hrtfDB to the coder.const too.

Thanks

[Ryan Livingston]

Rather than:

hrtfDB=  load ('ReferenceHRTF.mat');
hrtfData=coder.const(hrtfDB.hrtfData);

Try using:

hrtfDB = coder.load ('ReferenceHRTF.mat');
hrtfData = hrtfDB.hrtfData;