Q:

How to plot for imported data while performing some operations on different columns?

I have imported an Excel file, then I did multiplied different numbers with different columns;
Data=Import["file"][[1]];

Convert={1,25,37}#&/Data;

PM23= sqrt[(Convert[[All,2]])^2+(Convert[[All,3]])^2];

Now, I want to plot First column with 2, and 3 column separately, So for I have tried;
M = ListLinePlot[Convert[[All, {1, PM23}]], AxesLabel -> {"Qk", "M"}]

But, it didn't work. Any help will appreciated.

A:

See Part. Part takes location indices and PM23 is not a list of indices.  Even if it were you syntax would still be incorrect. 
You need to construct the two data series, see ListLinePlot.  Something like the following show work.
ListLinePlot[Transpose@{Convert[[All, 1]], #} & /@ Transpose@PM23, AxesLabel -> {"Qk", "M"}]

Hope this helps.

