Formatting the ticks in a plot

Hello,

I am working on a plot in which I need to modify the value of the xticks. A snippet of my code is attached below:

fig=figure()

gs=matplotlib.gridspec.GridSpec(1,2,width_ratios=[3,1])
gs.update(wspace=0.1)
ax=subplot(gs[0])
ylabel(‘Frequency (cm’+r’$^{-1}$’+’)’)

for i in range(0,len(ydata)):
    plot(xdata[i],ydata[i],'r-',linewidth=1.5)
plot(xdata[0],[0.0]*len(xdata[0]),'k:')
pos=[0,49.9856985699,99.9713971397,170.661849982,212.979781775,283.67023461\

7,333.655933187,375.97386498]
locs,labels=xticks(pos,[r’$\Gamma$’,‘X’,‘M’,r’$\Gamma$’,‘Z’,‘A’,‘R’,‘X’])
for i in range(0,len(pos)):
plt.axvline(x=pos[i],linewidth=0.5,color=‘k’,alpha=0.5)

axis([0,375.98,0,300])
ax2=subplot(gs[1])
plot(dosydata,dosxdata,'r-',linewidth=1.5)
a=gca()
b=a.get_xticks()
print b
a.xaxis.set_ticks([0.0, 0.015, 0.03])

a.tick_params(axis=‘x’,labelsize=14)

a.set_xlim([0,0.03])
a.set_ylim([0,300])                           
ax.label_outer()
ax2.label_outer()
show()

It’s a plot with two subplots. Anyway, the issue I’m running into concerns the x-axis on the second subplot. As you can see I have set it explicitly with “a.xaxis.set_ticks([0.0, 0.015, 0.03])”. However, when I do this it shows up as (0.000, 0.015,0.030) which I would really like it to look like (0,0.015,0.03). In other words, I don’t want extra zeros because they are unnecessary and make the text run into my other subplot. So I need to be able to format them somehow. How would I achieve this selective formatting (because of course I want 0.015 to show up that way and not 0.01).

Thanks so much in advance for the help!

Best,

Brad

Brad,

Matplotlib axes objects have set_xticklabels methods. It's brute
force, but this will work:
ax = gca()
ax.set_xticks([0., 0.015, 0.03])
ax.set_xticklabels(['0', '0.015', '0.03'])

Hope that helps,
-paul

···

On Thu, Mar 29, 2012 at 1:13 PM, Brad Malone <brad.malone@...287...> wrote:

Hello,

I am working on a plot in which I need to modify the value of the xticks. A
snippet of my code is attached below:

          fig=figure\(\)

gs=matplotlib\.gridspec\.GridSpec\(1,2,width\_ratios=\[3,1\]\)
gs\.update\(wspace=0\.1\)
ax=subplot\(gs\[0\]\)
ylabel\(&#39;Frequency \(cm&#39;\+r&#39;$^\{\-1\}$&#39;\+&#39;\)&#39;\)
for i in range\(0,len\(ydata\)\):
    plot\(xdata\[i\],ydata\[i\],&#39;r\-&#39;,linewidth=1\.5\)
plot\(xdata\[0\],\[0\.0\]\*len\(xdata\[0\]\),&#39;k:&#39;\)

pos=[0,49.9856985699,99.9713971397,170.661849982,212.979781775,283.67023461\
7,333.655933187,375.97386498]

locs,labels=xticks(pos,[r'$\Gamma$','X','M',r'$\Gamma$','Z','A','R','X'])
for i in range(0,len(pos)):
plt.axvline(x=pos[i],linewidth=0.5,color='k',alpha=0.5)
axis([0,375.98,0,300])
ax2=subplot(gs[1])
plot(dosydata,dosxdata,'r-',linewidth=1.5)
a=gca()
b=a.get_xticks()
print b
a.xaxis.set_ticks([0.0, 0.015, 0.03])
a.tick_params(axis='x',labelsize=14)
a.set_xlim([0,0.03])
a.set_ylim([0,300])
ax.label_outer()
ax2.label_outer()
show()

It's a plot with two subplots. Anyway, the issue I'm running into concerns
the x-axis on the second subplot. As you can see I have set it explicitly
with "a.xaxis.set_ticks([0.0, 0.015, 0.03])". However, when I do this it
shows up as (0.000, 0.015,0.030) which I would really like it to look like
(0,0.015,0.03). In other words, I don't want extra zeros because they are
unnecessary and make the text run into my other subplot. So I need to be
able to format them somehow. How would I achieve this selective formatting
(because of course I want 0.015 to show up that way and not 0.01).

Thanks so much in advance for the help!

Best,
Brad

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Paul,

That fixes my problem perfectly. Thanks for the solution!

Best,

Brad

···

On Thu, Mar 29, 2012 at 1:59 PM, Paul Hobson <pmhobson@…287…> wrote:

Brad,

Matplotlib axes objects have set_xticklabels methods. It’s brute

force, but this will work:

ax = gca()

ax.set_xticks([0., 0.015, 0.03])

ax.set_xticklabels([‘0’, ‘0.015’, ‘0.03’])

Hope that helps,

-paul

On Thu, Mar 29, 2012 at 1:13 PM, Brad Malone <brad.malone@…287…> wrote:

Hello,

I am working on a plot in which I need to modify the value of the xticks. A

snippet of my code is attached below:

          fig=figure()
gs=matplotlib.gridspec.GridSpec(1,2,width_ratios=[3,1])
gs.update(wspace=0.1)
ax=subplot(gs[0])
ylabel('Frequency (cm'+r'$^{-1}$'+')')
for i in range(0,len(ydata)):
    plot(xdata[i],ydata[i],'r-',linewidth=1.5)
plot(xdata[0],[0.0]*len(xdata[0]),'k:')

pos=[0,49.9856985699,99.9713971397,170.661849982,212.979781775,283.67023461\

7,333.655933187,375.97386498]

locs,labels=xticks(pos,[r’$\Gamma$’,‘X’,‘M’,r’$\Gamma$’,‘Z’,‘A’,‘R’,‘X’])

for i in range(0,len(pos)):
    plt.axvline(x=pos[i],linewidth=0.5,color='k',alpha=0.5)
axis([0,375.98,0,300])
ax2=subplot(gs[1])
plot(dosydata,dosxdata,'r-',linewidth=1.5)
a=gca()
b=a.get_xticks()
print b
a.xaxis.set_ticks([0.0, 0.015, 0.03])

a.tick_params(axis=‘x’,labelsize=14)

a.set_xlim([0,0.03])
a.set_ylim([0,300])
ax.label_outer()
ax2.label_outer()
show()

It’s a plot with two subplots. Anyway, the issue I’m running into concerns

the x-axis on the second subplot. As you can see I have set it explicitly

with “a.xaxis.set_ticks([0.0, 0.015, 0.03])”. However, when I do this it

shows up as (0.000, 0.015,0.030) which I would really like it to look like

(0,0.015,0.03). In other words, I don’t want extra zeros because they are

unnecessary and make the text run into my other subplot. So I need to be

able to format them somehow. How would I achieve this selective formatting

(because of course I want 0.015 to show up that way and not 0.01).

Thanks so much in advance for the help!

Best,

Brad


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