how to sort the vectors to positive n negative of same elements?

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Jayanta Deb 2017-3-7

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https://ww2.mathworks.cn/matlabcentral/answers/328524-how-to-sort-the-vectors-to-positive-n-negative-of-same-elements

评论： Jayanta Deb 2017-3-7

Hi All, say i have a vector v = [1,-2,3,4,5,6,7,8,9,77,44,88,99,-1,95,-6,-7,-8,-9] now i want to check element by element if there is a same element with opposite sign(1, -1) in the array and plot it as zero in their respective points in the x axis. Please note: i do not need to store the values in the variable and just need to plot it. How can i implement that?

thanks

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Answer 1

Stephen23 2017-3-7

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https://ww2.mathworks.cn/matlabcentral/answers/328524-how-to-sort-the-vectors-to-positive-n-negative-of-same-elements#answer_257649

编辑：Stephen23 2017-3-7

在 MATLAB Online 中打开

>>  v = [1,-2,3,4,5,6,7,8,9,77,44,88,99,-1,95,-6,-7,-8,-9]
v =
    1   -2    3    4    5    6    7    8    9   77   44   88   99   -1   95   -6   -7   -8   -9
>> out = v .* ~ismember(v,-v)
out =
    0   -2    3    4    5    0    0    0    0   77   44   88   99    0   95    0    0    0    0
>> plot(out)

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Stephen23 2017-3-7

编辑：Stephen23 2017-3-7

在 MATLAB Online 中打开

Then do the opposite:

out = v .* ismember(v,-v)

If neither of these resolve your question then please explain exactly what you want together with example input and output data. Your original question states "..if there is a same element with opposite sign(1, -1) in the array and plot it as zero..", and that is exactly what my answer gives you: values which are both positive and negative in the vector are plotted as zero.

Jayanta Deb 2017-3-7