Efficient way of preallocating memory
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Hello,
Just wondering is there a better way to preallocate memory for a bunch of 4D arrays. Because so far the way I am doing it, the code stops with the error- Out of memory.
The way I am doing it so far is below
Human_Data.Dimension_Vertical =Size_Human_tmp22(1); % = 256
Human_Data.Dimension_Horizontal=Size_Human_tmp22(2); % = 256
Human_Data.Dimension_Slice =Size_Human_tmp22(4); % = 16
Human_Data.Dimension_Repitition=Size_Human_tmp22(3)/2; % = 64
Human_Data.Image_Matrix_Tag=single(zeros(Human_Data.Dimension_Vertical,Human_Data.Dimension_Horizontal, Human_Data.Dimension_Repitition, Human_Data.Dimension_Slice));
Human_Data.Image_Matrix_Control=single(zeros(Human_Data.Dimension_Vertical,Human_Data.Dimension_Horizontal,Human_Data.Dimension_Repitition, Human_Data.Dimension_Slice));
Human_Data.Image_Matrix_Control_Tag_Sub=single(zeros(Human_Data.Dimension_Vertical,Human_Data.Dimension_Horizontal,Human_Data.Dimension_Repitition,Human_Data.Dimension_Slice));
Human_Data.Image_Matrix_Control_Tag_Avg=single(zeros(Human_Data.Dimension_Vertical,Human_Data.Dimension_Horizontal, Human_Data.Dimension_Repitition, Human_Data.Dimension_Slice));
so all the matrices look like 256 x 256 x 64 x 16
Thanks in advance!
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Antworten (2)
Sean de Wolski
am 24 Feb. 2012
One thing is to use the class input to zeros so that the zero matrix is never created in double precision. As you have it right now:
single(zeros(10));
the matrix is first created in double precision and converted to single later.
zeros(10,10,'single');
avoids this.
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Walter Roberson
am 24 Feb. 2012
Instead of single(zeros(P,Q,R,W)), use zeros(P,Q,R,W,'single')
Otherwise you are allocating double-precision values and then throwing away the half memory not needed for 'single'. When you use 'single' as an argument to zeros() then single precision will be allocated directly.
Note: each of your arrays is 256 megabytes when stored as single precision, so you need at least 1 gigabyte of free storage to hold all four arrays.
(By the way, you might want to change 'Repititon' to 'Repetition')
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