How to obtain element-wise squaring of vector/matrix? - Printable Version +- HP Forums (https://www.hpmuseum.org/forum) +-- Forum: HP Calculators (and very old HP Computers) (/forum-3.html) +--- Forum: HP Prime (/forum-5.html) +--- Thread: How to obtain element-wise squaring of vector/matrix? (/thread-14057.html) How to obtain element-wise squaring of vector/matrix? - mbeddo - 11-26-2019 07:40 PM I'm implementing a non-linear fitting routine and [/code]I need to square the elements of a vector from within a program. From the CAS screen I can easily square the elements of a vector [1, 2, 3, 4]: [attachment=7858] The simple program below has a syntax error: Code: ``` EXPORT DEMO() BEGIN   LOCAL myvec;   myvec := [1, 2, 3, 4];   apply(x→x^2, myvec); END;``` I don't know what I'm doing wrong. I looked for a function that would square element-wise, and "apply" seemed to fit the bill. I'm trying to avoid a FOR loop. I think it would be easier if I just squared a list of numbers, then converted the answer to a vector? RE: How to obtain element-wise squaring of vector/matrix? - swagner53 - 11-26-2019 08:47 PM Hi, apply is a CAS command that does not work under Home. Try converting to a CAS program by sandwiching your code between #cas and #end. Hopefully, that will work. Take care & good luck, Steve RE: How to obtain element-wise squaring of vector/matrix? - goetz - 11-26-2019 11:18 PM Alternatively you could also use the "point" operator .^ for element wise power operator on a vector or matrix , e.g.: Code: `[1, 2, 3, 4].^2` resulting in: [1, 4, 9, 16] RE: How to obtain element-wise squaring of vector/matrix? - mbeddo - 11-27-2019 07:16 AM (11-26-2019 08:47 PM)swagner53 Wrote:  Hi, apply is a CAS command that does not work under Home. Try converting to a CAS program by sandwiching your code between #cas and #end. Hopefully, that will work. Take care & good luck, Steve I found this works: Code: ``` #cas DEMO2():= BEGIN   apply(x→x^2, [1, 2, 3, 4]); END; #end``` Thanks! RE: How to obtain element-wise squaring of vector/matrix? - mbeddo - 11-27-2019 07:20 AM (11-26-2019 11:18 PM)goetz Wrote:  Alternatively you could also use the "point" operator .^ for element wise power operator on a vector or matrix , e.g.: Code: `[1, 2, 3, 4].^2` resulting in: [1, 4, 9, 16] Fantastic! It seems I still have a ways to go digesting the reference manual - these point operators didn't register while searching for element-wise operators. Guess I have a ways to go to learn how to search the documents.