topic Sum only selected rows of a column in Discussions

Sum only selected rows of a column

twillkickers — Tue, 07 Aug 2018 13:36:11 GMT

Is there an easy way to sum only the selected rows of a column and save the value to a global variable?

Re: Sum only selected rows of a column

txnelson — Tue, 07 Aug 2018 14:30:29 GMT

Here is a simple script to do what you want

Names Default To Here( 1 );
dt = Open( "$SAMPLE_DATA/big class.jmp" );
dt << set table variable( "my variable", Col Sum( If( Selected(), :height, . ) ) );

Re: Sum only selected rows of a column

twillkickers — Tue, 07 Aug 2018 14:53:19 GMT

How is this type of variable called? I can't call it using ::my variable

Re: Sum only selected rows of a column

uday_guntupalli — Tue, 07 Aug 2018 15:11:55 GMT

@twillkickers,
They are referenced the same way you would reference a column

dt = Open( "$SAMPLE_DATA/big class.jmp" );
dt << Select Randomly(0.1); 
dt << set table variable( "myvariable", Col Sum( If( Selected(), :height, . ) ) );

Print(:myvariable);

Re: Sum only selected rows of a column

dale_lehman — Tue, 07 Aug 2018 15:49:59 GMT

If you want to do this without using a script, first select the rows (using whatever method you want). Then, under Rows-Select-Name selection in column, you create a column of 0 and 1 that identifies the selected rows. Then create a new column using the Column Sum formula and put the newly created Named selection in column as the By variable. The result will show the sum for the selected and unselected rows.

Re: Sum only selected rows of a column

twillkickers — Thu, 09 Aug 2018 18:16:44 GMT

Thank you. This works for me. Is there a function similar to "set table variable" which sets the value as a global variable? (:: instead of :) I am having to take the table variable and save it as a global variable to do my calculations.

Re: Sum only selected rows of a column

txnelson — Thu, 09 Aug 2018 18:23:22 GMT

::myGlobalVariable = Col Sum( If( Selected(), :height, . ) );