About P1D derivative() method: - Printable Version +- jWork.ORG forums ( http://jwork.org/forum)+-- Forum: DataMelt ( /forumdisplay.php?fid=1)+--- Forum: Discussion of new DataMelt features ( /forumdisplay.php?fid=4)+--- Thread: About P1D derivative() method: ( /showthread.php?tid=65) |

About P1D derivative() method: - feilangrenM - 05-13-2014 11:30 AM
Hi, I have a problem when using P1D derivative() method. I have a filled P1D instance defined as "P1D p1=new P1D（double[],double[]） " without errors added. And p1 can be plotted accurately, but the problem happened when excuting"P1D p2=p1.derivative()" . This is the wrong message: java.lang.NullPointerException at jhplot.P1D.getYupper(P1D.java:4824) at jhplot.P1D.derivative(P1D.java:5245) at com.sbl.io.video.ScanTest3.main(ScanTest3.java:134) I'll be very grateful for your help! Thanks ColdWind RE: About P1D derivative() method: - sergei175 - 05-14-2014 11:11 AM
Hello, Yes, this is a bug. In fact, the derivative can be calculate only if there are stat. error on Y, but this is not your case. I've put this correction to the Beta version v1.8 http://jwork.org/scavis/releases There is a also a small example in http://jwork.org/scavis/wikidoc/doku.php?id=man:data:data_collections#using_data_collections that make this plot (attached) [attachment=2] RE: About P1D derivative() method: - feilangrenM - 05-23-2014 10:44 AM
(05-14-2014 11:11 AM)sergei175 Wrote: Hello, Thank you,Sergei. Maybe,this is the problem. But,The "scavis_onejar1.6" used in my JAVA project hasn't been updated. Can you do something for that? |