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On Mon, Dec 14, 2009 at 11:58:31AM +0000, Terry Hill wrote: > > I've attached the file so you can take a look if you're interested. > The problem lies in the X axis, which shows concentration of solutions > used. I cant get the scale right, as the gap between 0 and 0.1 is the > same as for say 0.3 to 0.5, so it gives the chart a "kink". Secondly, > I'd prefer the Molarity listed along the bottom, but no amount of > fiddling lets me. > > Lastly, I'd like to highlight the point where the % change is at 0, > and draw a line down to show the molarity at this point (as this shows > the innate water potential of the potato cells). > > If anyone can help I'd appreciate it, I'm getting balder by the > minute. Also I'd like to shut up one rather smug m$ office user who > views me as a peasant for using OO. See attached as an initial chart using gnuplot Commands to generate the graph in gnuplot were as follows reset set key autotitle columnheader set mxtics 2 set mytics 2 set grid set ylabel "% change" set xlabel "Molarity" f(x)=0 plot "datafile" using 1:2 title "Molarity vs % change" with lines x1y1, \ f(x) set term png set output "chart.png" replot set term X11 You will need to store your data in a plain text file called "datafile" in two columns. The first column is molarity, the second column is % change See http://t16web.lanl.gov/Kawano/gnuplot/index-e.html for gnuplot FAQ http://www.gnuplot.info/docs/node1.html for commands There is a great deal of flexibility using gnuplot, however if you want to analyse and plot the data then I would suggest spending some time learning R Finally I suspect the problem you had with your openoffice chart was using the options "lines", if you chose an XY plot then the problem might disappear. However... I think gnuplot is better -- Henry Photocopies or faxes of my signature are not binding. This email has been signed with an electronic signature in accordance with subsection 7(3) of the Electronic Communications Act 2000. Digital Key Signature: GPG RSA 0xFB447AA1 Mon Dec 14 13:47:20 GMT 2009
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