## [Matplotlib-users] Defining a precise x-axis max in plot()

 [Matplotlib-users] Defining a precise x-axis max in plot() From: Lionel (Lee) Brooks 3rd - 2011-01-25 01:12:45 ```Hello Gentlepeople, I am plotting an integer array using: matplotlib.pyplot.plot(). For my purposes it is imperative that the x-axis be explicitly defined. I have tried to achieve this by using: matplotlib.pyplot.axis(v). Where v is a list of integer values corresponding to the desired axes limits [xmin, xmax, ymin, ymax]. However, the x-axis that is displayed does not obey my explicit xmax declaration; the value is rounded up. Here is the relevant portion of my code: fig = pyplot.figure(figsize=(16,8)) ax1 = fig.add_axes([0.05, 0.15, 0.9, 0.8]) v = [0, len(myintvector), 0, max(myintvector, key=int)] ax1.axis(v) ax1.plot(myintvector, 'r--') The reason that I need the x-axis to match the length of my integer vector is because I am also drawing a colorbar immediately below the plot, the values of which describe the same integer vector. Therefore I need the colorbar coordinates to match the x-axis coordinates of my plot. I hope that I have described my issue coherently. Please be kind (N00b alert). Any help is greatly appreciated! Sincerely, Lionel 'Lee' Brooks 3rd Dartmouth Genetics Grad Student ```

 [Matplotlib-users] Defining a precise x-axis max in plot() From: Lionel (Lee) Brooks 3rd - 2011-01-25 01:12:45 ```Hello Gentlepeople, I am plotting an integer array using: matplotlib.pyplot.plot(). For my purposes it is imperative that the x-axis be explicitly defined. I have tried to achieve this by using: matplotlib.pyplot.axis(v). Where v is a list of integer values corresponding to the desired axes limits [xmin, xmax, ymin, ymax]. However, the x-axis that is displayed does not obey my explicit xmax declaration; the value is rounded up. Here is the relevant portion of my code: fig = pyplot.figure(figsize=(16,8)) ax1 = fig.add_axes([0.05, 0.15, 0.9, 0.8]) v = [0, len(myintvector), 0, max(myintvector, key=int)] ax1.axis(v) ax1.plot(myintvector, 'r--') The reason that I need the x-axis to match the length of my integer vector is because I am also drawing a colorbar immediately below the plot, the values of which describe the same integer vector. Therefore I need the colorbar coordinates to match the x-axis coordinates of my plot. I hope that I have described my issue coherently. Please be kind (N00b alert). Any help is greatly appreciated! Sincerely, Lionel 'Lee' Brooks 3rd Dartmouth Genetics Grad Student ```
 Re: [Matplotlib-users] Defining a precise x-axis max in plot() From: Eric Firing - 2011-01-25 04:57:37 ```On 01/24/2011 02:49 PM, Lionel (Lee) Brooks 3rd wrote: > Hello Gentlepeople, > > I am plotting an integer array using: matplotlib.pyplot.plot(). > For my purposes it is imperative that the x-axis be explicitly defined. > I have tried to achieve this by using: matplotlib.pyplot.axis(v). > Where v is a list of integer values corresponding to the desired axes > limits [xmin, xmax, ymin, ymax]. > However, the x-axis that is displayed does not obey my explicit xmax > declaration; the value is rounded up. > > Here is the relevant portion of my code: It is always better to provide a minimal but complete self-contained example illustrating the problem. > > fig = pyplot.figure(figsize=(16,8)) > ax1 = fig.add_axes([0.05, 0.15, 0.9, 0.8]) > v = [0, len(myintvector), 0, max(myintvector, key=int)] > ax1.axis(v) > ax1.plot(myintvector, 'r--') I am not seeing the problem when I try what I think is a minimal example; what version of mpl are you using? And have you tried calling axis after the call to plot? This might have been necessary in some earlier versions; I don't recall. (In ipython -pylab, my example was this: ax1 = gca() ax1.axis([0,9.9,0,9.9]) ax1.plot([1,2]) draw() in which no rounding occurs.) Eric > > The reason that I need the x-axis to match the length of my integer > vector is because I am also drawing a colorbar immediately below the > plot, the values of which describe the same integer vector. Therefore I > need the colorbar coordinates to match the x-axis coordinates of my plot. > > I hope that I have described my issue coherently. Please be kind (N00b > alert). > Any help is greatly appreciated! > > Sincerely, > Lionel 'Lee' Brooks 3rd > Dartmouth Genetics Grad Student ```