Matlab (2008a-32bit) single precision bug -



Matlab (2008a-32bit) single precision bug -

if create single precision operation values, give result ending 8:

>> single(single(6.500001e+02)*single(-64.1775131)*single(0.65)*single(2)) ans = -5.4230008e+004

then create operation using double precision, , same operation before, using single precision, result different first time run it:

>> double(6.5000012e+02)*double(-64.1775131)*double(0.65)*double(2) ans = -5.423000858119204e+004 >> single(single(6.500001e+02)*single(-64.1775131)*single(0.65)*single(2)) ans = -5.4230004e+004

this problem happens in matlab 2008a 32 bits. not problem in matlab 2012b 64 bits.

any thoughts on how avoid problem?

thank you.

i not test but, find on matlab central, seems bug in global workspace @versions r2008*. so, avoid problem:

don't execute code command window; stick double precision, unless under severe memory constraints (it's faster, because default type double); work in functions rather scripts (apparently function local workspace not affected bug) use r2009+ matlab release, seems have fixed bug.

matlab

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