Inserting a previously calculated value in a legend in matplotlib

问题

This should be simple, but I haven't found it: I have a value (the coefficient R squared) previously calculated and I want to insert it in a legend in matplotlib. If the value calculated is r_squared, this is not working:

plt.plot(x, y, linestyle='solid', color='k', label=r'Fitting line with $R^{2} = $, r_squared')

It just don't read the value.

Thanks.

回答1:

You could just use string formatting :

plt.plot(x, y, linestyle='solid', color='k', label="Fitting line with $R^{{2}} = {}".format(r_squared))

来源：https://stackoverflow.com/questions/41674696/inserting-a-previously-calculated-value-in-a-legend-in-matplotlib