I plotted graph for e^x^2 then i used show integral. when i move the graph changes. Reproducible: Always Steps to Reproduce: 1.Create new function(Cartesian plot) 2.Enter f(x)=e^x^2 3.Go to integral tab and press show integral 4.Move the graph around Actual Results: When the graph is moved left it shows correct graph. when it is moved right wrong graph Expected Results: Shown a consistent graph of integral e^x^2 I don't know what other functions cause this error check the graph http://www.wolframalpha.com/input/?i=integrate+e^x^2&dataset=&equal=Submit 90% other graphing software give error screen shot http://postimg.org/image/hroeu4yyh/
This is better graph http://www.wolframalpha.com/share/clip?f=d41d8cd98f00b204e9800998ecf8427eluqe9l1lm2
Just a side mark: KmPlot with the default step correctly calculates integral at least when the minimum value for x is -3 (and for sure, for x in [-1, 1] as on the Mathematica plot). It fails for a wider range because of the cumulative finite difference calculation error. It is hard to determine a condition to stop calculations if f(x) becomes too big for integral calculations.
Git commit 2b63a01634fc1653ead0ec9caeae4ed89fc95165 by Yuri Chornoivan. Committed on 15/01/2020 at 18:59. Pushed by yurchor into branch 'master'. Keep cumulated error negligible for rapidly increasing functions Summary: The current scheme violates Runge-Kutta condition on error O(h^4) when dy is too high. This leads to visible shifting and discontinuities on the plots of integrals for e^x^2, e^abs(x), etc. Test Plan: 1. Compile and install KmPlot. 2. Create the Cartesian plot "f(x) = e^x^2". 3. Switch to the "Integral" tab and tick the "Show integral" item. 4. Try to change the scale (Ctrl+mouse wheel). The integral curve should be plotted as expected (no discontinuities, no extra lines on Ox). f(x)=e^x^2 and its integral Before the patch: {F7764991} After the patch: {F7764992} Reviewers: #kde_edu Subscribers: aacid, cfeck, kde-edu Tags: #kde_edu Differential Revision: https://phabricator.kde.org/D24972 M +3 -2 kmplot/xparser.cpp https://commits.kde.org/kmplot/2b63a01634fc1653ead0ec9caeae4ed89fc95165