https://community.jmp.com/t5/Discussions/What-do-square-brackets-mean-in-JMP-JSL/m-p/388070#M63824 Square brackets refer to matrices.<BR />a = [ 1, 2, 3 ];<BR />or they refer to subscripts in lists<BR />bList = { "A", "B:, "C" };<BR />x =blist[1];<BR /><BR />I suggest you take the time to read the Scripting Guide, which is found in the JMP Documentation Library, found under the Help pull down menu. It will give you the details of the structures and syntax of JSL. Mon, 24 May 2021 22:10:53 GMT txnelson 2021-05-24T22:10:53Z https://community.jmp.com/t5/Discussions/What-do-square-brackets-mean-in-JMP-JSL/m-p/388067#M63823 <P>I have, in a loop:</P><PRE><CODE class=" language-jsl">to_update = dt &lt;&lt; get rows where (num(dt:Number) == ID); write(to_update);</CODE></PRE><P>giving</P><PRE><CODE class=" language-jsl">... [199, 200] ... [209, 210] ...</CODE></PRE><P>What do square brackets mean, therefore?</P> Fri, 09 Jun 2023 19:47:48 GMT https://community.jmp.com/t5/Discussions/What-do-square-brackets-mean-in-JMP-JSL/m-p/388067#M63823 mostarr 2023-06-09T19:47:48Z https://community.jmp.com/t5/Discussions/What-do-square-brackets-mean-in-JMP-JSL/m-p/388070#M63824 Square brackets refer to matrices.<BR />a = [ 1, 2, 3 ];<BR />or they refer to subscripts in lists<BR />bList = { "A", "B:, "C" };<BR />x =blist[1];<BR /><BR />I suggest you take the time to read the Scripting Guide, which is found in the JMP Documentation Library, found under the Help pull down menu. It will give you the details of the structures and syntax of JSL. Mon, 24 May 2021 22:10:53 GMT https://community.jmp.com/t5/Discussions/What-do-square-brackets-mean-in-JMP-JSL/m-p/388070#M63824 txnelson 2021-05-24T22:10:53Z