Dear users of smath forum, I want to ask question.

How to choose value from second row of "table" by coincidence value "a" with value of first row of "table".
It should be something like "vlookup" in excel.

See below example what I've done, but it do not work.

Could you please help me to write this correctly.

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I guess you have to handle in a better way the range bounds (and there's no needs of nesting loops). In your example the last iteration fails because you call for the cols(table)+1 column of the matrix.

An example here

If you are looking for interpolation InterpBilinear() may helps

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Thank you very much, your post is very helpful.

Yes, I look for way to create bilinear interpolation.