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From: Alessandro Salvatori <asalvatori@ju...>  20050617 23:11:58

BEGIN PGP SIGNED MESSAGE Hash: SHA1 i really beg your pardon... usually i always refrain from asking silly questions before having thought lengthly enough... but i was too much in a hurry what a shame... I've found out that set set yrange [1:1e5] set log y does the trick thank you :) Alessandro Salvatori wrote: > Hi, > sorry to bother, but i have very little time and google is not > helping much :( > > is there a way to flip the yaxis (have values increase from the top > to the bottom)? > it's not just a matter of giving labels to tics and putting a minus in > front of the second column of data, as my plot is in logscale... > > thank you very much indeed! > Alessandro Salvatori   SF.Net email is sponsored by: Discover Easy Linux Migration Strategies from IBM. Find simple to follow Roadmaps, straightforward articles, informative Webcasts and more! Get everything you need to get up to speed, fast. http://ads.osdn.com/?ad_id=7477&alloc_id=16492&op=click _______________________________________________ Gnuplotinfo mailing list Gnuplotinfo@... https://lists.sourceforge.net/lists/listinfo/gnuplotinfo BEGIN PGP SIGNATURE Version: GnuPG v1.4.1ecc0.1.6 (GNU/Linux) Comment: Using GnuPG with Thunderbird  http://enigmail.mozdev.org iD8DBQFCs1hLzvGMPC6Aeb4RAko/AJ9Ejzj7mkd4BNbjwoCnNv8ahu4B6ACfVH5u 3yxkNg3xbQ3wGCZbhTodhzs= =NBis END PGP SIGNATURE 
From: Alessandro Salvatori <asalvatori@ju...>  20050617 22:34:00

BEGIN PGP SIGNED MESSAGE Hash: SHA1 Hi, sorry to bother, but i have very little time and google is not helping much :( is there a way to flip the yaxis (have values increase from the top to the bottom)? it's not just a matter of giving labels to tics and putting a minus in front of the second column of data, as my plot is in logscale... thank you very much indeed! Alessandro Salvatori BEGIN PGP SIGNATURE Version: GnuPG v1.4.1ecc0.1.6 (GNU/Linux) Comment: Using GnuPG with Thunderbird  http://enigmail.mozdev.org iD8DBQFCs09izvGMPC6Aeb4RAj4xAJ96npV5R0EQ3GWKvjBXNcSUqMtzlQCeJpTc 5kSbmVxX5k67cY1/pqcZbr8= =iSRI END PGP SIGNATURE 
From: Smyth, Steve <Steve.S<myth@nr...>  20050617 13:38:36

Is it possible to read in formula constants form a datafile. I have numerous functions that I would like to plot on the same figure. All of the functions have the same form, but slightly different constants. For simplicity, say the function is f(x)=a*x. Can "a" be read in from a datafile and then f(x) plotted? Any guidance would be appreciated. Thanks Steve Smyth 
From: Eckard Specht <specht@hy...>  20050617 12:44:50

Dear HansBernhard, thank you very much for the explanation. In all interactive gnuplot sessions, such problems can be recognized and avoided. But for 'batch' sessions this strategy is too restrictive. However, gnuplot is a wonderful tool. <a href=http://hydra.nat.unimagdeburg.de/praktikum/>Here</a>; is the "little helper". Best regards, Eckard 
From: HansBernhard Broeker <broeker@ph...>  20050617 09:52:43

Eckard Specht wrote: > gnuplot comes up with a totally wrong regression line (i.e. a negative slope). > If one scratches one data pair from list, the result is correct. > > I have read in 'help fit' that this misfit can occur if the magnitudes of both > parameters a, b differ too much. This may be the case here. Not if the parameters are this different, the default startup values of 1.0 three orders of magnitude from the goal, and, which is the worst problem here, and the actual value for one of the fitted parameters (b) is zero, which makes it uncontrollable by the fit: fit m*x 'lreg3.dat' via m gives a very nice fit already: After 5 iterations the fit converged. final sum of squares of residuals : 2.48482e007 rel. change during last iteration : 6.69962e012 degrees of freedom (ndf) : 5 rms of residuals (stdfit) = sqrt(WSSR/ndf) : 0.000222927 variance of residuals (reduced chisquare) = WSSR/ndf : 4.96965e008 Final set of parameters Asymptotic Standard Error ======================= ========================== m = 6.62853e007 +/ 1.134e010 (0.01711%) So the actual result is b=0, which means the magnitude ratio of the parameters is *infinite*. That will indeed throw off the fit. > But a simple linear fit should always work. Or not? Not. It has a higher chance of success, but no guarantee. > Is it true that the MarquardtLevenberg algorithm is used for all fits? Yes. > Must I provide 'good' starting values for a, b to get a correct result? That, and a sensible model. Models in which parameters would fit zero won't work. 
From: Eckard Specht <specht@hy...>  20050617 09:06:10

Hi@..., I'm not sure if my fit problem with gnuplot is an old hat. I have built a site that helps students to get results from physical experiments by the help of gnuplot. All is well but for a simple linear fit I get wrong parameters. My data are: 6.03e5 0.4 6.79e5 0.45 7.54e5 0.5 8.30e5 0.55 9.05e5 0.6 9.81e5 0.65 which are stored in a file 'lreg3.dat'. My gnuplot commands are: f(x) = a*x+b fit f(x) 'lreg3.dat' via a,b plot f(x), 'lreg3.dat' gnuplot comes up with a totally wrong regression line (i.e. a negative slope). If one scratches one data pair from list, the result is correct. I have read in 'help fit' that this misfit can occur if the magnitudes of both parameters a, b differ too much. This may be the case here. But a simple linear fit should always work. Or not? Is it true that the MarquardtLevenberg algorithm is used for all fits? Must I provide 'good' starting values for a, b to get a correct result? This would be very inconvenient here. Thank you very much for your help/comments. Regards, Eckard 