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    • Yuri Chornoivan's avatar
      Keep cumulated error negligible for rapidly increasing functions · 2b63a016
      Yuri Chornoivan authored
      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.
      
      BUG: 341256
      
      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
      2b63a016
  30. 06 Jan, 2020 1 commit
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  32. 25 Nov, 2019 1 commit