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From: Richard Stover <richard@uc...>  20060216 23:20:56

HansBernhard Bröker <broeker <at> physik.rwthaachen.de> writes: > > Richard Stover wrote: > > I am measuring the flatness of a piece of silicon. The silicon > > is 30mm by 60 mm. I am using splot to produce a 3D plot of the > > measurements. I'd like to have the X axis twice as long as the > > Y axis instead of the equal length default. I haven't found any > > way to do this. I tried 'set size ratio 2' but apparently > > that applies only to 2D plots. > > 'set size ratio 1', however, should do something even in 3D. > > You may have to manually set the x and y axes to equal ranges in > addition to it. > Thanks for the suggestion. I tried ratio 1. That has no effect. I did some more experimenting with set size and found that 'set size 1,0.5' makes the Z axis halfsize, not Y. Apparently for a 3D plot the second number refers to the Z axis and the first is applied to both X and Y. 'set size 0.5,1' makes both X and Y halfsize while leaving Z its normal length. I tried 'set size 1,0.5,1' but gnuplot complains about the third number. Please let me know if you have any further suggestions. Richard 
From:
<broeker@ph...>  20060216 22:10:11

Richard Stover wrote: > I am measuring the flatness of a piece of silicon. The silicon > is 30mm by 60 mm. I am using splot to produce a 3D plot of the > measurements. I'd like to have the X axis twice as long as the > Y axis instead of the equal length default. I haven't found any > way to do this. I tried 'set size ratio 2' but apparently > that applies only to 2D plots. 'set size ratio 1', however, should do something even in 3D. You may have to manually set the x and y axes to equal ranges in addition to it. 
From: Richard Stover <richard@uc...>  20060216 21:12:20

I am measuring the flatness of a piece of silicon. The silicon is 30mm by 60 mm. I am using splot to produce a 3D plot of the measurements. I'd like to have the X axis twice as long as the Y axis instead of the equal length default. I haven't found any way to do this. I tried 'set size ratio 2' but apparently that applies only to 2D plots. Does anyone know how to tell splot to use X and Y axis lengths of a specified size (or ratio)? Thanks. Richard Stover 
From:
<broeker@ph...>  20060216 18:31:09

Nathan Hüsken wrote: > Hi, > Firstly thanks that you take the time answering me. It is strange, other > people > using Origin (a program I do not know at all) tell me, that they get a > correlation value. I am told, that the definition is: > > kor(X,Y) = cov(X,Y) / (sqrt(var(x)* var(y))) That's exactly the offdiagonal element of the correlation matrix which *is* output by 'fit'. 
From: Nathan <gnuplotinfo@lo...>  20060216 17:24:43

Hi, Firstly thanks that you take the time answering me. It is strange, other people using Origin (a program I do not know at all) tell me, that they get a correlation value. I am told, that the definition is: kor(X,Y) =3D cov(X,Y) / (sqrt(var(x)* var(y))) (kor stand for correlation, var stands for variance and cov stands for covariance). Now gnuplot gives me "variance of residuals", but what's about "cov"? Unfortanly, another value for the goodness does not really help because I a= m requested to proved the correlation. Thanks again! Nathan Quoting Marek Gutowski <gutow@...>: > Correlation is a notion taken from statistics. It tells us how > two (or more) random variables are "alike", i.e. how similar is > their behavior. Think, for example, of the height and of the > weight of people belonging to the certain population. The taller > the man then (most likely) the heavier he is. Or think of various > stock exchange indexes and their behavior. > If you have only one random variable (in your case it is the fitted > parameter 'a'), then it has to be perfectly correlated with itself. > So gnuplot gives you correct information. It is also correct that > correlation matrix is just a number (a 1 x 1 matrix) in this case. > > I have an impression that what you really need is some measure > of 'goodness of fit'. There are many of them, and gnuplot provides > you with the one called 'chi square' or 'chi square per degree of > freedom'. VERY roughly speaking: if CHISQ/NDF falls into the range > [1/2, 2] then the fit seems reasonable; more precisely  there is > no good reason to reject the hypothesis that your formula (f(x)=3Da*x) > is satisfactory to describe your data. Contrary, if CHISQ/NDF > 2, > then your data are almost surely not linear, as you might think. > But be carefull, the case of small CHISQ/NDF, say below 1/2, is > suspected, and calls for closer investigation (or for more data). > > It is still more complicated to explain how the values of CHISQ, > obtained for the formula f(x)=3Da*x, and obtained for the other but > similar case f(x)=3Da*x+b (using the same data) are helpful in deciding > which formula (of the two) is more appropriate for your data. > You need some statistical tables for this. > > > Marek Gutowski > > > On Thu, Feb 16, 2006 at 04:10:30PM +0100, Nathan H=FCsken wrote: >> Hello together, >> I am fitting Data into a linear function, like f(x)=3Da*x. >> Now I want the correlation value for the fit. All I get is the >> correlation matrix, which is always one :(. >> I must admit, that I do not know exactly what the correlation value is. >> How can I get it? >> Thanks! >> Nathan >> >> > 
From: Nathan <gnuplotinfo@lo...>  20060216 15:10:37

Hello together, I am fitting Data into a linear function, like f(x)=a*x. Now I want the correlation value for the fit. All I get is the correlation matrix, which is always one :(. I must admit, that I do not know exactly what the correlation value is. How can I get it? Thanks! Nathan 
From:
<broeker@ph...>  20060216 05:30:36

Shehjar Tikoo wrote: > Its not surprising but just that, i was looking for a way to make the > bars display without the overlaps. Is there a way to do that? Change the x positions of your data. It's your data, so I have no way of telling if, and by how much, such a movement may be allowable. The fact that you omitted all x axis ticking and labeling seems to suggest you couldn't care less. But nobody except you can decide that. 
From: Shehjar Tikoo <shehjart@cs...>  20060216 01:18:35

On Wed, Feb 15, 2006 at 10:33:31AM +0100, HansBernhard Br?ker wrote: > Of course they do. If you make the boxes wider than the distance of > your data points, they'll overlap. I wonder how that could be surprising. Its not surprising but just that, i was looking for a way to make the bars display without the overlaps. Is there a way to do that? > Shehjar Tikoo wrote: > > >I am trying to increase the boxwidth of a plot. The first one is here: > > > >http://www.cse.unsw.edu.au/~shehjart/temp/temp.png > > > >Now I tried to increase the boxwidth(set boxwidth 3) of the bars but on > >inreasing that, > >the boxes overlap 