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FloatArray prevents rounding #1873

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capocasa opened this issue Feb 21, 2016 · 4 comments
Closed

FloatArray prevents rounding #1873

capocasa opened this issue Feb 21, 2016 · 4 comments

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@capocasa
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0.02 Is a floating point number. However, if it is inside a FloatArray, that number will never be reached precisely, which can cause rounding errors.

a=FloatArray[0.1];

expected:
=> FloatArray[ 0.1 ]

actual:
=> FloatArray[ 0.10000000149012 ]

a[0] = a[0].round(0.01);

expected:
=> FloatArray[ 0.1 ]

actual:
=> FloatArray[ 0.10000000149012 ]

This works:

a[0].round(0.01);
=> 0.1

a[0].round(0.01).class;
=> Float
@redFrik
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redFrik commented Feb 21, 2016

nothing strange. it has been discussed many times on the sc-users mailing list for example in the 'Strange modulo behavior' thread.
or use a=DoubleArray[0.1];

@capocasa capocasa mentioned this issue Feb 21, 2016
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@telephon
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Why not use an Array directly?

@capocasa
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@telephon To avoid making a copy of a FloatArray from a SoundFile.

@capocasa
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@jamshark70 's explanation in #1874 clears it up.

@telephon telephon closed this as completed Mar 4, 2016
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@capocasa @telephon @redFrik