topic Re: << Get Values from a Column without subsetting each set of row selection. in Discussions

<< Get Values from a Column without subsetting each set of row selection.

jump — Mon, 15 Sep 2014 23:52:24 GMT

So, I have a big dataset. Currently I am selecting few rows for each condition, subsetting the data and run << get values (im My JSL script) to move data to defined LIST. This process is taking significant time, because as i mentioned dataset is huge.

I want to know, if there is a way to << get values from a column for the selected rows without doing subset everytime. \

Or I have to subset every time to << get values from desired ROW\Column.

Thanks

Re: << Get Values from a Column without subsetting each set of row selection.

Jeff_Perkinson — Thu, 07 Sep 2017 18:10:00 GMT

You can get the value of a column for a given row by subscripting to that row.

For example:

dt=open("$SAMPLE_DATA\Big Class.jmp");
:name[1];

Will return "Katie" which is the name in the first row.

Likewise, you can use a matrix for the subscript.

dt=open("$SAMPLE_DATA\Big Class.jmp");
:name[[2,3,4]];

That returns:

{"LOUISE", "JANE", "JACLYN"}

You can probably see where this is headed. The <<Get Selected Rows message returns a matrix, so you can use that to subscript directly to the column.

dt=open("$SAMPLE_DATA\Big Class.jmp");
rows=dt<<get selected rows;
:name[rows];

Re: << Get Values from a Column without subsetting each set of row selection.

jump — Tue, 16 Sep 2014 03:23:51 GMT

Yes, thanks you. will try that.