Maximum array size in MATLAB?

Question

I\'m writing a MATLAB program that will generate a matrix with 1 million rows and an unknown amount of columns (at max 1 million).

I tried pre-allocating this matrix

Answer 1

In older versions of Matlab that don't include the memory command, you can use:

feature memstats

Physical Memory (RAM):
    In Use:                              738 MB (2e2c3000)
    Free:                                273 MB (11102000)
    Total:                              1011 MB (3f3c5000)
Page File (Swap space):
    In Use:                             1321 MB (529a4000)
    Free:                               1105 MB (45169000)
    Total:                              2427 MB (97b0d000)
Virtual Memory (Address Space):
    In Use:                              887 MB (37723000)
    Free:                               1160 MB (488bd000)
    Total:                              2047 MB (7ffe0000)
Largest Contiguous Free Blocks:
     1. [at 4986b000]                    197 MB ( c585000)
     2. [at 3e1b9000]                    178 MB ( b2a7000)
     3. [at 1f5a0000]                    104 MB ( 6800000)
     4. [at 56032000]                     77 MB ( 4d3e000)
     5. [at 68b40000]                     70 MB ( 4660000)
     6. [at 3a320000]                     54 MB ( 3610000)
     7. [at 63568000]                     45 MB ( 2d48000)
     8. [at 35aff000]                     40 MB ( 2821000)
     9. [at 60f86000]                     37 MB ( 25ca000)
    10. [at 6f49d000]                     37 MB ( 25b3000)
                                        ======= ==========
                                         842 MB (34ac0000)

ans =

   207114240

You can't suppress the output, but it returns the largest memory block available ( 207,114,240 Bytes / 8 = 25,889,280 doubles )