From: John Hunter <jdhunter@ac...>  20040907 22:03:34

>>>>> "Darren" == Darren Dale <dd55@...> writes: Darren> With MPL 0.62.4, the following script is yielding a few Darren> badly formatted yaxis labels: Darren> import matplotlib from matplotlib.matlab import * Darren> a=array([2,4,6,8,10,12,14,16,18,20])*1e5 plot(a) show() Darren> I tried adding a "print s,m" statement after line 272: m = Darren> self._zerorgx.match(s), where s is the original text. Here Darren> is the output: Darren> 2.0e+005 <_sre.SRE_Match object at 0x01249608> 4.0e+005 Darren> <_sre.SRE_Match object at 0x01249608> 6.0e+005 Darren> <_sre.SRE_Match object at 0x01249608> 8.0e+005 Darren> <_sre.SRE_Match object at 0x01249608> 1.0e+006 Darren> <_sre.SRE_Match object at 0x01249608> 1.2e+006 None Darren> 1.4e+006 None 1.6e+006 None 1.8e+006 None 2.0e+006 Darren> <_sre.SRE_Match object at 0x01249608> Darren> _zerorgx = re.compile('^(.*?)\.?0+(e[+]\d+)?$'), which is Darren> greek to me (and I dont have a good reference on Darren> regexp's). There's a reason Jamie Zawinski said Some people, when confronted with a problem, think "I know, I'll use regular expressions." Now they have two problems. Here's a reimplementation using string methods. See if it passes all your tests. More importantly, do you agree that removing the zeros etc which aren't necessary to visually parse the number is a good idea? class ScalarFormatter(Formatter): """ Tick location is a plain old number. If viewInterval is set, the formatter will use %d, %1.#f or %1.ef as appropriate. If it is not set, the formatter will do str conversion """ def __call__(self, x, pos): 'Return the format for tick val x at position pos' self.verify_intervals() d = abs(self.viewInterval.span()) return self.pprint_val(x,d) def pprint_val(self, x, d): #if the number is not too big and it's an int, format it as an #int if abs(x)<1e4 and x==int(x): return '%d' % x if d < 1e2: fmt = '%1.3e' elif d < 1e1: fmt = '%1.3f' elif d > 1e5: fmt = '%1.1e' elif d > 10 : fmt = '%1.1f' elif d > 1 : fmt = '%1.2f' else: fmt = '%1.3f' s = fmt % x tup = s.split('e') if len(tup)==2: mantissa = tup[0].rstrip('0').rstrip('.') exponent = tup[1].replace('+', '').lstrip('0') s = '%se%s' %(mantissa, exponent) return s JDH 