Error : Constant Operands

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Life is Wonderful
Life is Wonderful on 23 Mar 2022
Edited: Life is Wonderful on 31 Mar 2022
Hi
Iam implementing following code as show below
m = 10;
v = [1 1 2 : m]
v = 1×11
1 1 2 3 4 5 6 7 8 9 10
If I try to make fixed point , I am getting the error "Operands must be constants." I don't understand what is expected here. Can someone help me ?
Thank you
  2 Comments
Life is Wonderful
Life is Wonderful on 25 Mar 2022
try to make this fixed point - Sorry I didn't write my requirment clearly.
I mean m is a Embedded.fi object here . Let say m = 10 , then class of m is 'double' but when I use numerictype or fi, then m is translated to 'embedded.fi'.
The problem i see colon operator doesn't seems to work for 'embedded.fi'.

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Accepted Answer

David Hill
David Hill on 25 Mar 2022
Does changing to double work? I don't have the toolbox
v = [1 1 2 : double(m)]
  1 Comment
Life is Wonderful
Life is Wonderful on 28 Mar 2022
Thanks a lot, it works

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More Answers (1)

Andy Bartlett
Andy Bartlett on 29 Mar 2022
I'm puzzled by the error you described "Operands must be constants.".
When I attempt to reproduce the issue, I don't observe any problem.
I created this simple function.
function y = makeVec(m)
y = [1 1 2 : m];
end
When I test this with double or fixed-point inputs
u1 = 10;
u2 = fi(10);
y1 = makeVec(u1)
y2 = makeVec(u2)
the outputs are as expected.
y1 =
1 1 2 3 4 5 6 7 8 9 10
y2 =
1 1 2 3 4 5 6 7 8 9 10
DataTypeMode: Fixed-point: binary point scaling
Signedness: Signed
WordLength: 16
FractionLength: 0
Code generation can provide additional restrictions, so I tried that too.
codegen makeVec -args {u1} -o makeVec1_mex
codegen makeVec -args {u2} -o makeVec2_mex
y1m = makeVec1_mex(u1)
y2m = makeVec2_mex(u2)
Again, the outputs were as expected.
y1m =
1 1 2 3 4 5 6 7 8 9 10
y2m =
1 1 2 3 4 5 6 7 8 9 10
DataTypeMode: Fixed-point: binary point scaling
Signedness: Signed
WordLength: 16
FractionLength: 0
If you could clarify the original reproduction steps, that would be appreciated.
Andy
  1 Comment
Life is Wonderful
Life is Wonderful on 29 Mar 2022
Edited: Life is Wonderful on 31 Mar 2022
The problem i see is coming from factorial function in matlab . Factorial function is unsupport by the fixed point designer . So I wrote my own implementation. I reliased the mistake in declaring fi Object and double togeather.

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