Linear regression

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Ludo
2010-04-03
2013-02-10
  • Ludo

    Ludo - 2010-04-03

    Hello

    I have a file called "valeurs" with the following data :
    247     21.2 253 23
    250     22.3 257 24.2
    254    23.3 260 25.2
    258  24.3 266 26.3
    264 26.5 275 28.3
    273      28.6 283 30.6
    279 30.6 292 32.7
    288    32.6 301 34.6
    297    34.6 310 36.5
    305  36.6 318 38.5
    314     38.6 328 40.6
    325    40.5

    I have an other file called valeurs.gnuplot with :
    set terminal jpeg
    set xlabel "Voltage en mV"
    set ylabel "Temperature en degres celsius"
    set title "Etalonnage du thermometre"
    plot "valeurs" using ($1):($2) with linespoints title "Serie 1", "valeurs" using ($3):($4) with linespoints title "Serie 2"

    That makes what I want, that means a graph. But now I would like to have a linear regression which calculate me the values of a and b (from y=ax+b) but I don't know how to do that … If someone could help me, that would be very nice !!!

     
  • Edoardo Pasca

    Edoardo Pasca - 2010-04-04

    You want to do a fit: then you just need the command "fit".
    For more info type

    help fit

    in the gnuplot shell.

    Edoardo

     
  • Ludo

    Ludo - 2010-04-07

    Hi

    Thanks for the answer but I've found the solution before.

     

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