Enable large arrays: Build octave such that it can use arrays larger than 2Gb.: Difference between revisions

Enable large arrays: Build octave such that it can use arrays larger than 2Gb. (edit)

16 bytes removed , 15 August 2016

Take example from Manual, previous one actually works. Minor formatting improvements.

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 <pre>
-octave:1> a = zeros(1024,1024,512);
+>> a = zeros (1024*1024*1024*3, 1, 'int8');
-error: memory exhausted or requested size too large for range of Octave's index type -- trying to return to prompt
+error: out of memory or dimension too large for Octave's index type
 </pre>
 You will obtain this error even if your system has enough RAM to create this array (4 GB in the above case).
-To use arrays with more than (approximately) 2 billion elements, Octave has to be configured with the option --enable-64. This option is experimental and you are (as always) encouraged to submit bug reports if you find a problem.
+To use arrays with more than (approximately) <math>2^{31}</math> elements, Octave has to be configured with the option <code>--enable-64</code>. This option is experimental and you are (as always) encouraged to submit bug reports if you find a problem.
 With this option, Octave will use internally 64-bit integers for array dimensions and indexing. However, '''all numerical libraries''' used by Octave will need to use also 64-bit integers for array dimensions and indexing, and in most cases they need to be compiled from source.