DPlot Forum Index DPlot
http://www.dplot.com
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

PIECEWISE LINEAR FITTING OF RESPONSE SPECTRUM IN TRIPARTITE

 
Post new topic   Reply to topic    DPlot Forum Index -> General discussion
View previous topic :: View next topic  
Author Message
Anbazhagan Panjamani



Joined: 06 Nov 2014
Posts: 4

PostPosted: Wed Feb 25, 2015 5:42 am    Post subject: PIECEWISE LINEAR FITTING OF RESPONSE SPECTRUM IN TRIPARTITE Reply with quote

Is there any option for piecewise linear fitting of 7 line segments through an earthquake response spectrum in a tripartite grid using least square fitting method and to get the break points of the fitted curve ??
There is few constraints :
1.) The third line segment should have a slope of 45 degrees (ie. parallel to the acceleration lines in atripartite grid)
2.) Slope of fourth line segment should be zero (horizontal)
3.) slope of the fifth line segment should be -45 degrees ( parallel to the displacement lines of the tripartite grid)
Back to top
View user's profile Send private message
DPlotAdmin
Site Admin


Joined: 24 Jun 2003
Posts: 2304
Location: Vicksburg, Mississippi

PostPosted: Wed Feb 25, 2015 12:42 pm    Post subject: Reply with quote

Controlling slope and/or magnitude can be done with Generate>More Curve Fits and fixing the appropriate coefficients. For example for your third line segment you'd enter -1 for B and check the Hold box.

There's no way to do this for 7 line segments at once, though.
_________________
David Hyde
support@dplot.com
Back to top
View user's profile Send private message Send e-mail Visit poster's website
Display posts from previous:   
Post new topic   Reply to topic    DPlot Forum Index -> General discussion All times are GMT - 5 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group