How do I create a new matrix based on elements from a previous matrix?

Question

Allie 2018-10-1

0
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https://ww2.mathworks.cn/matlabcentral/answers/421633-how-do-i-create-a-new-matrix-based-on-elements-from-a-previous-matrix

评论： Allie 2018-10-1

I have a matrix with columns depth and year. I have a vector, depth2, that is basically depth but with a few random rows missing. I would like an output that shows me what years correspond to the depths present in depth2.

depth=[1 2 3 4 5 6 7 8]

year=[2007 1960 1915 1871 1828 1785 1735 1680]

depth2=[3 4 5 7 8]

ideally year2 would be [1915 1871 1828 1735 1680]

The full depth/year matrix is size 149:2.

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Answer 1

ANKUR KUMAR 2018-10-1

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/421633-how-do-i-create-a-new-matrix-based-on-elements-from-a-previous-matrix#answer_339258

编辑：ANKUR KUMAR 2018-10-1

在 MATLAB Online 中打开

depth=[1 2 3 4 5 6 7 8]
year=[2007 1960 1915 1871 1828 1785 1735 1680]
depth2=[3 4 5 7 8]
year2=arrayfun(@(x) year(depth==x),depth2)

If the previous prog seems to be difficult for you, then you can use simply loop.

depth=[1 2 3 4 5 6 7 8]
year=[2007 1960 1915 1871 1828 1785 1735 1680]
depth2=[3 4 5 7 8]
for i =1:length(depth2)
    index=find(depth==depth2(i));
    year2(i)=year(index)
end