You problem isn't with colon indexing, but with the interpretation of the arguments to plot. multiple calls to plot with scalar arguments do not have the same result as a single call with array arguments. For this to work as intended, you would need plt.hold(True), for starters, and maybe there are other subtleties.
On Thu, May 1, 2014 at 1:31 PM, did did <21di...@gmx.com> wrote: > Hello all and sorry for my bad english, > > i am a beginner with python and i try to save a lot of data in several > folders in a 4D matrix > and then to plot two columns of this 4D matrix. > > Bellow, i have the code to fill my 4D matrix, it works very well : > > [CODE]matrix4D=[] > for i in Numbers: > readInFolder=folderPrefixe+i+"/" > matrix3D=[] > for j in listeOfdata: > nameOfFile=filePrefixe+i+"-"+j+extensionTXT > nameOfFile=readInFolder+nameOfFile > matrix2D=np.loadtxt(nameOfFile,delimiter=",",skiprows=1) > matrix3D.append(matrix2D) > matrix4D.append(matrix3D) > array4D = np.asarray(matrix4D)[/CODE] > > But now, i want to plot the third column as function of the third too > (just for trying) and i use > this stupid manner that works well : > > [CODE]plt.figure(1) > temp=plt.plot(array4D[0][0][0][0],array4D[0][0][0][0],'bo') > temp=plt.plot(array4D[0][0][1][0],array4D[0][0][1][0],'bo') > temp=plt.plot(array4D[0][0][2][0],array4D[0][0][2][0],'bo') > temp=plt.plot(array4D[0][0][3][0],array4D[0][0][3][0],'bo') > plt.show()[/CODE] > > Now, i want to use a more smart manner and i use ":" like this > > [CODE]plt.figure(1) > temp=plt.plot(array4D[0][0][0:3][0],array4D[0][0][0:3][0],'bo') > plt.show()[/CODE] > > The result should be the same but i don't got the same results!!! > > In attachement you have the two corresponding plots, can you explain to me > with > i don't have the same plots ?? > > thanks for all > _______________________________________________ > NumPy-Discussion mailing list > NumPy-Discussion@scipy.org > http://mail.scipy.org/mailman/listinfo/numpy-discussion > >
_______________________________________________ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
