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problem in preallocation

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huda nawaf
huda nawaf 2011-11-10
关闭： MATLAB Answer Bot 2021-8-20
hi, I used data with huge size, so I did preallocation A(147611,30977)=zeros But , I got this message: ??? Maximum variable size allowed by the program is exceeded.
what i have to do in this case?
thanks in advance

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回答（1 个）

Titus Edelhofer
Titus Edelhofer 2011-11-10
Hi Huda,
before going on waht you can do other, you are aware, that a matrix of size 147611x30977 will need approx. 34GB of memory?
Titus
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huda nawaf
huda nawaf 2011-11-10
in file there are integers and floating, but currently I read just integer.
I used just 1.92GB.
look please, in fact I convert that file into array
the structure of my file:
user id(integer) movie id(integer) rating(float)
in my file the id of users is frequent, so I try to place each user in row and draw his movie id and his rating .
So, the size of each row is different , and because i used preallocate i have to specify the size. I know the no. of rows but I don't know the no. of columns. So I give the largest(30977).
I'm on right or not?
please help me, I have in the same point since some days.
thanks
the array (147611*30977)
Walter Roberson
Walter Roberson 2011-11-10
I do wonder whether the "social network"'s web site's Terms and Conditions allow this use of the data?
Anyhow, sounds to me like a good place to use cell arrays, or perhaps struct.

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