add drawGraph func

README.md

@@ -27,7 +27,12 @@ The `greenlablib` module is a python module intends to simplify ROOT based routi
 >>> pl.drawBinContent(D[0],D[1])  # SetBinContent reimplementation
 ```
 
+#### TGraph drawGraph(npoints,xarr,yarr,name='g',title='graph')
+```
+>>> pl.drawGraph(D[-1],D[0],D[1])  # TGraph reimplementation
+```
+
 ### Math functions:
 
-## float getMuErr(stat,mu):
-## float getMuErrNoise(stat,mu,dcr=0,gate=1):
+#### float getMuErr(stat,mu):
+#### float getMuErrNoise(stat,mu,dcr=0,gate=1):

gplot.py

@@ -89,3 +89,19 @@ def drawBinContent(bin_arr,val_arr,name='h',title='histo',nbins=100,bin_first=0,
     h.SetLineWidth(2)
     h.Draw("")
     return h
+
+
+def drawGraph(npoints,xarr,yarr,name='g',title='graph'):
+    '''
+    Implements the TGraph ROOT method
+    '''
+    xarr = cd(xarr)
+    yarr = cd(yarr)
+    g = TGraph(npoints,xarr,yarr)
+    g.SetNameTitle(name,title)
+    g.GetYaxis().SetMaxDigits(3);
+    g.SetMarkerStyle(20);
+    g.SetMarkerSize(0.6);
+    g.SetMarkerColor(4);
+    g.Draw("AP")
+    return g