[Matplotlib-users] line width adjustments From: James Boyle - 2004-02-23 17:21 ```I would like to be able to change the width of a line. If I just use B/W the use of line widths and styles can differentiate a number of lines. Currently, I do this: p = plot(datar,-1.0*(pr),'b') p.extend( plot(datac,-1.0*(pc),'r--')) p[0].set_linewidth(2) p[1].set_linewidth(3) Is this the way to do this? or is there something more eleganf. It might be useful for the third argument to have color, style and width. I have not been able to figure out how to change the line thickness of the axis frame, i.e. the x and y axis themselves. There are examples for the grid, if one is used, and the tick marks but not the frame itself. Thanks for any help. Jim ```
 Re: [Matplotlib-users] line width adjustments From: John Hunter - 2004-02-23 17:45 ```>>>>> "James" == James Boyle writes: James> I would like to be able to change the width of a line. If James> I just use B/W the use of line widths and styles can James> differentiate a number of lines. Currently, I do this: p = James> plot(datar,-1.0*(pr),'b') p.extend( James> plot(datac,-1.0*(pc),'r--')) p[0].set_linewidth(2) James> p[1].set_linewidth(3) James> Is this the way to do this? or is there something more James> elegant. I guess beauty is in the eye of the beholder, but I find this more elegant liner, linec = plot(datar, -1.0*pr, 'b', datac, -1.0*pc, 'r--') liner.set_linewidth(2) linec.set_linewidth(3) James> It might be useful for the third argument to have color, James> style and width. It's certainly doable, but my hesitancy in doing this is that there are a lot of properties of a line that one could make an argument for putting in the format string. matthew suggested allowing a label as in 'r--;red line' (ala octave). Should the alpha property be in there? My inclination is to follow the python design philosophy of "one obvious way to do it". Perhaps a better solution is to allow keyword args to the plot command plot(datar, -1.0*pr, 'b', linewidth=0.2, label='a red line', alpha=0.2) This could be extended to handle plot multiple plots with one command as follows plot(x1, y1, 'b', x2, y2, 'r--', linewidth=(2,3), label=('a blue line', 'a red line'), alpha=(1.0,0.5), antialiased = (True,False)) legend can be altered to use line labels if they exist, so you could build the legend of this plot just by callinging legend() I find this the kwargs approach a little cleaner than having a mother-of-all-format-strings. James> I have not been able to figure out how to change the line James> thickness of the axis frame, i.e. the x and y axis James> themselves. There are examples for the grid, if one is James> used, and the tick marks but not the frame itself. Just an oversight on my part - I've been adding these neglected accessor methods as people need them. The axes border is a patches.Rectangle instance. If you add the following accessor method to class Axes (on or around line 598) def get_frame(self): "Return the axes Rectangle frame" return self._axesPatch I just added it to the src tree. You can then control the axes rectangle as well, as in this example from matplotlib.matlab import * ax = subplot(111) plot([1,2,3]) frame = ax.get_frame() frame.set_linewidth(3.0) frame.set_facecolor('r') frame.set_edgecolor('y') show() Hope this helps, JDH ```
 Re: [Matplotlib-users] line width adjustments From: James Boyle - 2004-02-23 19:01 ```On Feb 23, 2004, at 9:16 AM, John Hunter wrote > > Perhaps a better solution is to allow keyword args to the plot command > > plot(datar, -1.0*pr, 'b', > linewidth=0.2, label='a red line', alpha=0.2) > > This could be extended to handle plot multiple plots with one command > as follows > > plot(x1, y1, 'b', x2, y2, 'r--', > linewidth=(2,3), label=('a blue line', 'a red line'), > alpha=(1.0,0.5), antialiased = (True,False)) > I strongly agree with the kwargs approach, it makes things clear as to what is being set. > Just an oversight on my part - I've been adding these neglected > accessor methods as people need them. The axes border is a > patches.Rectangle instance. If you add the following accessor method > to class Axes (on or around line 598) > > def get_frame(self): > "Return the axes Rectangle frame" > return self._axesPatch > from matplotlib.matlab import * > ax = subplot(111) > plot([1,2,3]) > frame = ax.get_frame() > frame.set_linewidth(3.0) > frame.set_facecolor('r') > frame.set_edgecolor('y') > show() I applied this patch and it worked fine. On my Mac I use the PS backend and convert to PDF. With the default frame width (0.5), the frame was not visible using Adobe Reader 6.0. The file printed fine, but the on screen viewing omitted the frame. This might be a personal problem on my setup, but it might be useful if other people have this difficulty. Making the frame width equal to 1 fixes things. using matplotlib and lovin' it. Jim ```