manipulation of seperate vector values

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Yusuf
Yusuf 2011-4-4
so i have a vector set of values and wanted to round all the values to the nearest positive, even integer. and all the values less then zero are rounded to zero. any idea on how to do this using an mfile?

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采纳的回答

Jan
Jan 2011-4-4
v(v<0) = 0;
v = round(v/2) * 2;

更多回答（2 个）

Paulo Silva
Paulo Silva 2011-4-4
%v is your vector
idx=v<0; %get the index of all values lower than 0
idx1=v>0; %get the index of all values higher than 0
v(idx)=0; %substitute the lower than 0 values by 0
v(idx1)=round(v(idx1)) %substitute higher than 0 values by nearest positive
In case you want a special form of the round function that does nearest positive and even integer get the round2even function or round2
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Paulo Silva
Paulo Silva 2011-4-4
That's shorter but does unnecessary rounding of the negative values
Jan
Jan 2011-4-4
Correct. Therefore your method will be faster, if a lot of negative numbers occur.

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Yusuf
Yusuf 2011-4-4
yes thanks that works but i need it to round to the nearest even integer?

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