That's impossible to answer without seeing a good deal more details of the problem. For starters: the actual data, the exact gnuplot command sequence, the version of gnuplot you're running.
I'm having a problem during fit my data.
I have data for x,y,z and I want find a good correlation for z as a function of x and y. From the data vizualization I can guess that the expression will be z=-ax+by+c. I tried fit the data with this kind of expression and I obtained
"Singular matrix in Invert RtR error during fit"
If I try an expression like z=-x+y+c there are no problems with the data fitting, but the expression predict higher values and not so close to the data as expected. Then I tried adjust by hand the a,b and c parameters and I get a better approximation to the data than the previous.
Why is this happening and how can I solve it?
That's impossible to answer without seeing a good deal more details of the problem. For starters: the actual data, the exact gnuplot command sequence, the version of gnuplot you're running.
Please find in attachment the actual data and the exact gnuplot command
sequence tested. I'm using gnuplot version 4.6.
I'm quite new on using gambit to fit 3D data...
2014-03-07 21:46 GMT+01:00 Hans-Bernhard Broeker broeker@users.sf.net:
That's impossible to answer without seeing a good deal more details of the
problem. For starters: the actual data, the exact gnuplot command sequence,
the version of gnuplot you're running.
- [support-requests:#165]
http://sourceforge.net/p/gnuplot/support-requests/165/ Singular matrix in
Invert RtR error during fit*Status: open
Group:
Created: Fri Mar 07, 2014 11:41 AM UTC by Carla
Last Updated: Fri Mar 07, 2014 11:41 AM UTC
Owner: nobodyI'm having a problem during fit my data.
I have data for x,y,z and I want find a good correlation for z as a
function of x and y. From the data vizualization I can guess that the
expression will be z=-ax+by+c. I tried fit the data with this kind of
expression and I obtained"Singular matrix in Invert RtR error during fit"
If I try an expression like z=-x+y+c there are no problems with the data
fitting, but the expression predict higher values and not so close to the
data as expected. Then I tried adjust by hand the a,b and c parameters and
I get a better approximation to the data than the previous.Why is this happening and how can I solve it?
Sent from sourceforge.net because you indicated interest in
https://sourceforge.net/p/gnuplot/support-requests/165/To unsubscribe from further messages, please visit
https://sourceforge.net/auth/subscriptions/
The reason is quite simple: your commands failed to actually make a 3D fit because they lack the necessary "using" specification.
fit f(x,y) "3DdataLinear.txt" using 1:2:3:(1.0) via a0,a1,a2
would have worked.
It is working now. Thank you!
2014-03-08 22:05 GMT+01:00 Hans-Bernhard Broeker broeker@users.sf.net:
The reason is quite simple: your commands failed to actually make a 3D fit
because they lack the necessary "using" specification.fit f(x,y) "3DdataLinear.txt" using 1:2:3:(1.0) via a0,a1,a2
would have worked.
- [support-requests:#165]
http://sourceforge.net/p/gnuplot/support-requests/165/ Singular matrix in
Invert RtR error during fit*Status: open
Group:
Created: Fri Mar 07, 2014 11:41 AM UTC by Carla
Last Updated: Sat Mar 08, 2014 12:21 PM UTC
Owner: nobodyI'm having a problem during fit my data.
I have data for x,y,z and I want find a good correlation for z as a
function of x and y. From the data vizualization I can guess that the
expression will be z=-ax+by+c. I tried fit the data with this kind of
expression and I obtained"Singular matrix in Invert RtR error during fit"
If I try an expression like z=-x+y+c there are no problems with the data
fitting, but the expression predict higher values and not so close to the
data as expected. Then I tried adjust by hand the a,b and c parameters and
I get a better approximation to the data than the previous.Why is this happening and how can I solve it?
Sent from sourceforge.net because you indicated interest in
https://sourceforge.net/p/gnuplot/support-requests/165/To unsubscribe from further messages, please visit
https://sourceforge.net/auth/subscriptions/