Sum only selected rows of a column

[#1]

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

[#2]

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, . ) ) );

[#3]

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

[#4]

@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);

[#5 · Accepted solution]

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

[#6]

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.

[#7]

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.