reading a large binary file in MATLAB

Hello,

I have to read in a large Binary file whose size is 92,504 KB. When I am using fread command MATLAB is giving me error

Error using fread Out of memory. Type HELP MEMORY for your options.

I tried to restart MATLAB also so that if I am using any virtual memory it should be cleared but still the problem persists.

How can I solve this problem of reading data.

[dpb]

what does the MEMORY command show on your machine (type 'memory' at command prompt and post results...)

Try the long form

 [UV,SV]=memory

and look specifically at

 SV.PhysicalMemory.Available/1024/1024

Which version ML and OS?

[Ricky]

If I type 'memory' I get the below results.

Maximum possible array: 861 MB (9.024e+08 bytes) *

Memory available for all arrays: 861 MB (9.024e+08 bytes) *

Memory used by MATLAB: 391 MB (4.103e+08 bytes)

Physical Memory (RAM): 1910 MB (2.003e+09 bytes)

• Limited by System Memory (physical + swap file) available.Physical Memory (RAM): 1910 MB (2.003e+09 bytes)
• Limited by System Memory (physical + swap file) available.

[Ricky]

and If I run 'SV.PhysicalMemory.Available/1024/1024' at command prompt I get the below result

ans =

203.4063

[Ricky]

please help it is very urgent.

[Joseph Areeda]

what does your fread statement look like?

I've been reading 50 MB files with:

        in=fopen(fname,'r');
        x=fread(in,inf,'*double', 0, 'b');

I've found out of memory can sometimes be misleading.

Joe

[Ricky]

below is the code I am using for reading my binary file

fid = fopen('dump_20_master.dump','r');

[data,count] = fread(fid,'uint8');

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/29922-why-your-question-is-not-urgent-or-an-emergency

[Ricky]

I am sorry for using the word urgent .

Answer 1

[Walter Roberson]

fread(fid,'uint8') reads uint8 data and converts it to double. You should leave it as uint8 using fread(fid,'*uint8')