## [Matplotlib-users] [matplotlib-users] Using variables in annotations

 [Matplotlib-users] [matplotlib-users] Using variables in annotations From: Manuel Wittchen - 2009-12-31 09:56:29 Hi, Is it possible to print the value of a variable in an annotation? Example: gradient = 2.0 intercept = 3.0 r-value = 0.99 ax.annotate('f(x) = gradient * x + intercept R^2 = r-value', xy=(2.9,-0.75), xytext=(2.9,-0.75)) Where gradient, intercept and r-value should be replaced by the value of the variables in the output. Regards and a happy new year! Manuel Wittchen

 [Matplotlib-users] [matplotlib-users] Using variables in annotations From: Manuel Wittchen - 2009-12-31 09:56:29 Hi, Is it possible to print the value of a variable in an annotation? Example: gradient = 2.0 intercept = 3.0 r-value = 0.99 ax.annotate('f(x) = gradient * x + intercept R^2 = r-value', xy=(2.9,-0.75), xytext=(2.9,-0.75)) Where gradient, intercept and r-value should be replaced by the value of the variables in the output. Regards and a happy new year! Manuel Wittchen
 Re: [Matplotlib-users] [matplotlib-users] Using variables in annotations From: Johan Grönqvist - 2009-12-31 13:22:01 Manuel Wittchen skrev: > Is it possible to print the value of a variable in an annotation? > Example: > > gradient = 2.0 > intercept = 3.0 > r-value = 0.99 > > ax.annotate('f(x) = gradient * x + intercept R^2 = r-value', > xy=(2.9,-0.75), xytext=(2.9,-0.75)) > I feel that a main advantage of matplotlib (over other solutions I have used) is that there is a complete programming language available. In this case, just use the standard string handling of python. See e.g. http://docs.python.org/library/stdtypes.html#string-formatting Untested code: annotation_string = "f(x) = %f * x + %f R^2 = %f" % (gradient, intercept, r-value) ax.annotate(annotation_string, xy=(2.9,-0.75), xytext=(2.9,-0.75)) / johan