How to round decimals to other decimal values already defined

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Pilar Jiménez 2017-11-29

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https://ww2.mathworks.cn/matlabcentral/answers/370076-how-to-round-decimals-to-other-decimal-values-already-defined

评论： Stephen23 2017-12-1

Hello, I would like to request your support to know how to round certain decimal values to others closer. For example, if I have [0.359 0.679 0.890 0.5653] I would like to know how I can round up these values to only take the following [0.2 0.4 0.6 0.8] depending on the value in which they are. So for example 0.359 would be rounded to 0.4, 0.679 to 0.8, etc. The criterion in the example is: less than 0.65 is the value of the nearest smaller number that is 0.6 and greater than or equal to 0.65 is the value of the next higher number that would be 0.8

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Stephen23 2017-12-1

Why 0.65?

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Answer 1

KVM 2017-11-29

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https://ww2.mathworks.cn/matlabcentral/answers/370076-how-to-round-decimals-to-other-decimal-values-already-defined#answer_293839

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 This is a way of doing it! : 
 a =  [0.359 0.679 0.890 0.5653];
 b = [0.2 0.4 0.6 0.8];
 newA =0;
 for iLoop = 1:length(a)
    c = b-a(iLoop);
    d = c( c>=0 );%Keep only Positive Value 
    [e index] = min(d);
    if ~isempty(d);
        newA(iLoop) = e+a(iLoop);
    else
        newA(iLoop) =0; % Default Value
    end
 end
 newA %Display Result