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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Anti-Spam Code: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Forum: Origin Forum Subject: Message: * HTML is OFF * Forum Code is ON Smilies Origin Ver. 2021b and Service Release (Select Help-->About Origin): SR2 Operating System: Windows 10 Hi, I was trying to add two columns from a book - Book1 with two columns from another one - Book2 - with the sum displayed in a third book - Book3 (please check the image below). I have tried to convert the book s into matrices and then do matrix addition from Script Command, but it didn't recognise the name of the matrices. Is there a quick, reliable and error-free (as much as possible) way to do? Either through GUI, LAbTalk or Embedded Python? If yes, can I please have the step-by-step recipe on how to do it? Regards, Tibi [img]https://my.originlab.com/ftp/forum_and_kbase/Images/Books%20addition.JPG[/img]   Check here to subscribe to this topic.