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When the input is gpuArray for bitxor function I get this error. How I solve it?

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amenah mwuafaq 2020-12-12

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评论： Walter Roberson 2020-12-18

When the input is gpuArray for bitxor function I get this error. How I solve it?

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KALYAN ACHARJYA 2020-12-13

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>>whos X1
>>whos X2

Please provide?

amenah mwuafaq 2020-12-13

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Hi KALYAN ACHARJYA,

c=  gf(randi(16,[row col pag di]),8);
Co1=double(c.x);
      X1=(double(Packet)).*Co1;
co2=gf(randi(16,[row col pag di]),8);
C2=double(co2.x);
Y1=(double(Packet2)).*C2;

Walter Roberson 2020-12-13

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Well those are both clearly datatype double(), and bitxor() requires that at least one of the two inputs be an integer class (the other can be either the same integer class or can be a scalar double.)

We do not know what range Packet and Packet2 are so we cannot guess which value range X1 and X2 are.

amenah mwuafaq 2020-12-16

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Hi Walter Roberson

Thanks for answering me

This is my code..

Packet= (videoFrames(:,:,:,Begin:end1));
[row, col, pag, di]=size(Packet);
coefficient=  gf(randi(GFin,[row col pag di]),8);
C1=(double(coefficient.x));
      X1=gpuArray((((double(Packet)).*C1)));
Packet2= (videoFrames(:,:,:,end1+1:end));
[row2, col2, pag2, di2]=size(Packet2);
coefficient2=gf(randi(GFin,[row2 col2 pag2 di2]),8);
C2=(double(coefficient2.x));
Y1=gpuArray(((double(Packet2)).*C2));
z=bitxor(X1,Y1);

Walter Roberson 2020-12-16

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It looks like GFin is probably 16. In that case, when you take the x property of the gf() result, you are going to get uint32() of the result of the randi() . What is the purpose of going through the gf() step ?

Is it correct that class(videoFrames) is uint8 ?

It looks to me as if you are effectively working with 12 bit integers? uint8 video data, times random value that is up to 16, so maximum 4080 ?

amenah mwuafaq 2020-12-17

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Gfin is sometimes 4, 8

The equation I'm working on selects random numbers from GF.

Yes, video frames, it's uint8 .

Same setting. If I don't use gpuArray, no error message appears

The error message appears only when using gpuArray. Why?

Walter Roberson 2020-12-17

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What difference do you observe between selecting random numbers from gf and selecting random integers with the same maximum?

amenah mwuafaq 2020-12-17

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I must choose random numbers from GF

Walter Roberson 2020-12-18

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How do you propose to choose random numbers from a gf?

If you have an array named data that is nonnegative integers in the range 0 to 255, and you have

g = gf(data, 8)

Now you want to pick a random element from g

idx = randi(numel(g)) 
rg = g(idx) 
rgfd = gf(data(idx), 8)

Are you expecting that rg and rgfd would be different?

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When the input is gpuArray for bitxor function I get this error. How I solve it?

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