I have a problem that I run into a lot with the 'legend' command's
default behavior. I've found a work-around but I wonder if there's a
better way.
For a simple example, take the following:
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x= [1,2,3,4,5,6,7,8]
a= [5,3,2,4,6,5,8,7]
b= [4,1,3,5,2,8,3,6]
c= [8,4,9,6,7,3,9,4]
DataSets= [a,b,c]
Symb= ['k-o','k--s','k-.^']
for index,d in enumerate(DataSets):
plot(x,DataSets[index],Symb[index])
legend(["a","b","c"])
_______________________________
This behaves just as I would want it to. Normally, though I want
'open' markers, which (AFAIK) require me to set the color to 'w'
(white), and so the (white-on-white) lines won't show up in this case
(the markers still have black outlines). I tried using two colors in
one marker definition, 'k-wo', but that didn't work.
The obvious solution is to plot the lines and symbols in two
different commands:
_______________________________
Symb= ['wo','ws','w^']
LineType= ['k-','k--','k-.']
for index,d in enumerate(DataSets):
plot(x,DataSets[index],LineType[index])
plot(x,DataSets[index],Symb[index])
legend(["a","b","c"])
_______________________________
This produces the correct plot, but the legend here alternates
between symbol and marker in its what uses for designating each dataset
(a uses 'marker a', b uses 'line b', c uses 'marker c').
Is there some rationale for this being the default behavior?
The workaround I've found has been to use two separate loops for the
symbol and line plotting:
_______________________________
Symb= ['wo','ws','w^']
LineType= ['k-','k--','k-.']
#Loop 1
for index,d in enumerate(DataSets):
plot(x,DataSets[index],LineType[index])
# Loop 2
for index,d in enumerate(DataSets):
plot(x,DataSets[index],Symb[index])
legend(["a","b","c"])
_______________________________
This works and will give me a legend that uses only marker symbols in
it, as desired. It's not an ideal solution though as I often have some
moderate amount of processing within the loop that I'd rather not have
to repeat or write out to some temporary variable just in order to have
it available for the second loop.
I've gotten around this before for somewhat similar cases using
suggestions from this group of explicitly defining the values the legend
will use:
L1= plot(x,y,...
but I can't figure how to do this here because of the looping over the
data sets.
On a related note, is there any way to increase the size of the
markers within the legend?
TIA,
J.S.
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