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int memsize=sf_memsize() | Max amount of RAM (in Mb) to be used
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string opt= | If y, change o and d parameters on the reversed axis;
if i, don't change o and d
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bool verb=n [y/n] | Verbosity flag
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int which=-1 | Which axis to reverse.
To reverse a given axis, start with 0,
add 1 to number to reverse n1 dimension,
add 2 to number to reverse n2 dimension,
add 4 to number to reverse n3 dimension, etc.
Thus, which=7 would reverse the first three dimensions,
which=5 just n1 and n3, etc.
which=0 will just pass the input on through unchanged.
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