[Gnuplot-bugs] Problem of Interpretation From: - 2006-06-12 12:58 Attachments: Message as HTML ```Hi Team, I write you let you know that Gnuplot seems to have a problem of interpreting mathematical expressions. Here is the version used: Version 4.0 patchlevel 0, last modified Thu Apr 15 14:44:22 CEST 2004 (System: Darwin 8.6.0) Hereafter, both two equations (as per the plot command line) are identical but written in the different way. Results depends on the location of parameter "a" in the plot command line. It turns out to be that the 1st plot is right, but the second plot (just the same equation but written differently) is wrong. Is it a known problem? Regards, Raf ### ### 1st Plot ### ### set terminal postscript landscape enhanced "Times-Roman" 22; set output "GoodPlot.ps" set key top left; set grid set xrange [0.22:2.5] dH=8 ; dT=6 plot f(x) = 0.5*dT*x*60*sqrt(x**2+(pi*a*(dH-dT)/60)**2)/a, \ a = 30, f(x) lw 4 title "N_O = &{0}30",\ a = 50, f(x) lw 4 title "N_O = &{0}50",\ a = 100, f(x) lw 4 title "N_O = 100",\ a = 200, f(x) lw 4 title "N_O = 200",\ a = 300, f(x) lw 4 title "N_O = 300" ### ### 2nd Plot ### ### set terminal postscript landscape enhanced "Times-Roman" 22; set output "WrongPlot.ps" set key top left; set grid set xrange [0.22:2.5] dH=8 ; dT=6 plot f(x) = 0.5*dT*x*(60/a)*sqrt(x**2+(pi*(a/60)*(dH-dT))**2), \ a = 30, f(x) lw 4 title "N_O = &{0}30 rpm",\ a = 50, f(x) lw 4 title "N_O = &{0}50 rpm",\ a = 100, f(x) lw 4 title "N_O = 100 rpm",\ a = 200, f(x) lw 4 title "N_O = 200 rpm",\ a = 300, f(x) lw 4 title "N_O = 300 rpm" ```