topic Re: How does JSL implement the sorting of memory arrays? in Discussions

How does JSL implement the sorting of memory arrays?

lala — Tue, 14 May 2024 02:28:34 GMT

Thanks!

dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
ar = dt << GetAsMatrix( {2, 4} );
ar << Sort( By( 1 ), Order( Descending ), replace table );//？？

Of course, this code is just a try.

Re: How does JSL implement the sorting of memory arrays?

jthi — Tue, 14 May 2024 05:52:49 GMT

You can sort vectors and lists but I'm not sure if you can sort matrix by specific column. But you can always convert that matrix to private table, sort it and get it back into matrix.

Names Default To Here(1);

dt = Open("$SAMPLE_DATA/Big Class.jmp");
ar = dt << GetAsMatrix({2, 4});

dt_m = As Table(ar, <<private);
dt_m << Sort(By(1), Order(Descending), Replace Table);

ar1 = dt_m[0,0];
Close(dt_m, no save);

show(ar, ar1);

Re: How does JSL implement the sorting of memory arrays?

Craige_Hales — Tue, 14 May 2024 09:12:34 GMT

You might find something in useful. The Rank() function is often overlooked.