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DeutschFile:Curve fitting.svg
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Summary
| Description | English: This graph shows a series of points (generated by a Sin function) approximated by polinomial curves (red curve is linear, green is quadratic, orange is cubic and blue is 4th degree). Italiano: Il grafo mostra una serie di punti (generati dalla funzione seno) approssimati da curve polinomiali (in rosso di primo grado, verde di secondo, arancione di terzo e verde di quarto. |
| Date | |
| Source | Own work |
| Author | Krishnavedala |
| Other versions | File:Curve fitting.jpg |
W3C-validity not checked.
GNU Octave source code |
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x = 1:1.5:100; y = sin(x/10); p1 = polyfit(x,y,1); p2 = polyfit(x,y,2); p4 = polyfit(x,y,4); p3 = polyfit(x,y,3); figure; plot(x,y,'k.'); hold all plot(x,polyval(p1,x),'r'); plot(x,polyval(p2,x),'g'); plot(x,polyval(p3,x),'color',[1 .5 0]); plot(x,polyval(p4,x),'b'); grid on set (gca,'xaxislocation','zero') set (gca,'yaxislocation','zero') box off print('Curve fitting.svg') |
Python source Code |
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| Created using python with numpy and matplotlib toolboxes. from numpy import * from matplotlib.pyplot import * from mpl_toolkits.axes_grid.axislines import SubplotZero x = linspace(0,100,75) y = sin(2.*pi*x/60.+.4) y1 = poly1d(polyfit(x,y,1)) # linear y2 = poly1d(polyfit(x,y,2)) # quadratic y3 = poly1d(polyfit(x,y,3)) # cubic y4 = poly1d(polyfit(x,y,4)) # 4th degree fig = figure(figsize=(6,4)) ax = SubplotZero(fig,111) fig.add_subplot(ax) ax.grid(True) ax.plot(x,y1(x),'r',label=u'linear') ax.plot(x,y2(x),'g',label=u'quadratic') ax.plot(x,y3(x),'orange',label=u'cubic') ax.plot(x,y4(x),'b',label=u'$4^{th}$ order') ax.plot(x,y,'k.',label=u'data') ax.set_xlabel(u'x') ax.set_ylabel(u'y') ax.minorticks_on() ax.legend(frameon=False,loc=4,labelspacing=.2) setp(ax.get_legend().get_texts(), fontsize='small') fig.savefig("Curve fitting.svg",bbox_inches="tight",pad_inches=.15) |
Licensing
I, the copyright holder of this work, hereby publish it under the following license:
  | This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication. |
| The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 18:05, 1 October 2014 | | 512 × 384 (23 KB) | Krishnavedala | re-created using w:GNU Octave |
| 00:32, 7 September 2011 |  | 514 × 351 (117 KB) | Krishnavedala | {{Information |Description ={{en|1=This graph shows a series of points (generated by a Sin function) approximated by polinomial curves (red curve is linear, green is quadratic, orange is cubic and blue is 4th degree).}} {{it|1=Il grafo mostra una serie |
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