# A changing color in an autocovariance graph

All elements of the following function works correctly (in my first time I made a so stupid error I am ashamed).

```
def histoautocorr(v,a):
def conds(x,a) :
if abs(x) > a :
return x
else :
return 0
def condi(x,a) :
if abs(x) <= a :
return 0
else :
return x
vs=[conds(x,a) for x in v]
vi=[condi(x,a) for x in v]
histoa=bar_chart(vs,rgbcolor=(0.15,0.5,0.5), legend_label='$a < given value$')
histoa.axes_labels([r'$o$',r'$v(o)$'])
histoa.fontsize(7)
histob=bar_chart(vi,rgbcolor=(0, 1, 0.45),, legend_label=r'$a \leq< given value$')
histob.axes_labels([r'$o$',r'$v(o)$'])
histob.fontsize(7)
return show(histoa+histob)
```

when applied to

```
ts=finance.TimeSeries([random() for _ in range(100)])
v=[ts.autocovariance(j) for j in range(1,30)]
```

that is `histoautocorr(v,0.005)`

. but I would like a colored label saying "a" < a for the value of a used in the simulation. How can I do this , knowing that given vlaue is the one used for th plot and if possible the text must be in the corresponding color. I know that mathjax accept now colors and I knoiw th syntax, but it doesn't work undeer Firefox. Miss certainly something.

From errors to errors in my code I have changed the nature of the question.