topic Bug in line(X,Y) in Mathcad https://www.ptcusercommunity.com/t5/Mathcad/Bug-in-line-X-Y/m-p/288404#M112548 <HTML><HEAD></HEAD><BODY>Hello.<BR /><BR />I did a quick search and didn't come across a post that covered this bug in line(X,Y). If the vector Y holds all-zeros then the line function (linear regression) fails. Oddly, the error message varies.<BR /><BR />In some cases the message is:<BR /><BR />"The calculation resulted in a vector with no elements."<BR /><BR />In more cases, the message reads:<BR /><BR />"Object reference not set to an instance of an object."<BR /><BR /> - Guy<BR /><BR /><BR /><BR /></BODY></HTML> Thu, 03 May 2018 19:47:15 GMT GuyB 2018-05-03T19:47:15Z Bug in line(X,Y) https://www.ptcusercommunity.com/t5/Mathcad/Bug-in-line-X-Y/m-p/288404#M112548 Hello.I did a quick search and didn't come across a post that covered this bug in line(X,Y). If the vector Y holds all-zeros then the line function (linear regression) fails. Oddly, the error message varies.In some cases the message is:"The calculation resulted in a vector Thu, 03 May 2018 19:47:15 GMT https://www.ptcusercommunity.com/t5/Mathcad/Bug-in-line-X-Y/m-p/288404#M112548 GuyB 2018-05-03T19:47:15Z Bug in line(X,Y) https://www.ptcusercommunity.com/t5/Mathcad/Bug-in-line-X-Y/m-p/288405#M112549 <HTML><HEAD></HEAD><BODY>That's an obscure bug! It works fine if Y is a vector with all the elements identical, unless all the elements are 0. The slope, intercept, and medfit functions all work even if Y is all zeros.<BR /><BR />As you say, a weird error message too!<BR /><BR />Richard</BODY></HTML> Mon, 11 Jan 2010 08:00:00 GMT https://www.ptcusercommunity.com/t5/Mathcad/Bug-in-line-X-Y/m-p/288405#M112549 RichardJ 2010-01-11T08:00:00Z