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Error : Constant Operands

19 vues (au cours des 30 derniers jours)
Life is Wonderful
Life is Wonderful le 23 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 commentaires
Geoff Hayes
Geoff Hayes le 23 Mar 2022
@Jogger - please clarify what you mean by "try to make this fixed point". What line of code leads to the error message?
Life is Wonderful
Life is Wonderful le 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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Réponse acceptée

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

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Plus de réponses (1)

Andy Bartlett
Andy Bartlett le 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 commentaire
Life is Wonderful
Life is Wonderful le 29 Mar 2022
Modifié(e) : Life is Wonderful le 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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