@@ -910,7 +910,6 @@ def pprint_val(self, x, d):
910910 s = s .rstrip ('0' ).rstrip ('.' )
911911 return s
912912
913-
914913class LogFormatterExponent (LogFormatter ):
915914 """
916915 Format values for log axis using ``exponent = log_base(value)``.
@@ -951,6 +950,14 @@ class LogFormatterMathtext(LogFormatter):
951950 Format values for log axis using ``exponent = log_base(value)``.
952951 """
953952
953+ def _non_decade_format (self , sign_string , base , fx , usetex ):
954+ 'Return string for non-decade locations'
955+ if usetex :
956+ return (r'$%s%s^{%.2f}$' ) % (sign_string , base , fx )
957+ else :
958+ return ('$%s$' % _mathdefault ('%s%s^{%.2f}' %
959+ (sign_string , base , fx )))
960+
954961 def __call__ (self , x , pos = None ):
955962 """
956963 Return the format for tick value `x`.
@@ -981,13 +988,7 @@ def __call__(self, x, pos=None):
981988 if not is_decade and self .labelOnlyBase :
982989 return ''
983990 elif not is_decade :
984- if usetex :
985- return (r'$%s%s^{%.2f}$' ) % \
986- (sign_string , base , fx )
987- else :
988- return ('$%s$' % _mathdefault (
989- '%s%s^{%.2f}' %
990- (sign_string , base , fx )))
991+ return self ._non_decade_format (sign_string , base , fx , usetex )
991992 else :
992993 if usetex :
993994 return (r'$%s%s^{%d}$' ) % (sign_string ,
@@ -998,6 +999,28 @@ def __call__(self, x, pos=None):
998999 '%s%s^{%d}' %
9991000 (sign_string , base , nearest_long (fx ))))
10001001
1002+ class LogFormatterSciNotation (LogFormatterMathtext ):
1003+ """
1004+ Format values following scientific notation in a logarithmic axis
1005+ """
1006+
1007+ def __init__ (self , base = 10.0 , labelOnlyBase = False ):
1008+ super (LogFormatterSciNotation , self ).__init__ (base = base ,
1009+ labelOnlyBase = labelOnlyBase )
1010+
1011+ def _non_decade_format (self , sign_string , base , fx , usetex ):
1012+ 'Return string for non-decade locations'
1013+ b = float (base )
1014+ exponent = math .floor (fx )
1015+ coeff = b ** fx / b ** exponent
1016+ if is_close_to_int (coeff ):
1017+ coeff = nearest_long (coeff )
1018+ if usetex :
1019+ return (r'$%g\times%s^{%d}$' ) % \
1020+ (coeff , base , exponent )
1021+ else :
1022+ return (r'$\mathdefault{%g\times%s^{%d}}$' ) % \
1023+ (coeff , base , exponent )
10011024
10021025class LogitFormatter (Formatter ):
10031026 """
@@ -1250,6 +1273,11 @@ def __call__(self):
12501273 # hence there is no *one* interface to call self.tick_values.
12511274 raise NotImplementedError ('Derived must override' )
12521275
1276+ def show_tick_label (self , locs ):
1277+ """Return boolean array on whether to show a label for the given
1278+ locations"""
1279+ return np .ones (np .asarray (locs ).size , dtype = np .bool )
1280+
12531281 def raise_if_exceeds (self , locs ):
12541282 """raise a RuntimeError if Locator attempts to create more than
12551283 MAXTICKS locs"""
@@ -1894,6 +1922,33 @@ def tick_values(self, vmin, vmax):
18941922
18951923 return self .raise_if_exceeds (np .asarray (ticklocs ))
18961924
1925+ def show_tick_label (self , ticklocs ):
1926+ b = self ._base
1927+
1928+ vmin , vmax = self .axis .get_view_interval ()
1929+ vmin = math .log (vmin ) / math .log (b )
1930+ vmax = math .log (vmax ) / math .log (b )
1931+
1932+ numdec = abs (vmax - vmin )
1933+
1934+ if numdec > 3 :
1935+ sublabel = set ((1 ))
1936+ elif numdec > 2 :
1937+ sublabel = set ((1 , 3 ))
1938+ elif numdec > 1 :
1939+ sublabel = set ((1 , 2 , 5 ))
1940+ else :
1941+ sublabel = set ((1 , 2 , 4 , 7 ))
1942+
1943+ label = np .ones (ticklocs .size , dtype = np .bool )
1944+ for i , loc in enumerate (ticklocs ):
1945+ exponent = math .floor (math .log (abs (loc )) / math .log (b ))
1946+ coeff = loc / b ** nearest_long (exponent )
1947+ if nearest_long (coeff ) not in sublabel :
1948+ label [i ] = False
1949+
1950+ return label
1951+
18971952 def view_limits (self , vmin , vmax ):
18981953 'Try to choose the view limits intelligently'
18991954 b = self ._base
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