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Hi Sean, just wanted to suggest a tiny improvement.
When we plot axial force at each node, if we select both Fxi and Fxj for intermediate nodes (between 1 and 15 in the example), we get Fxj labels superimposed to Fxi labels. A simple solution could be to nest an if statement under the last elif
if(labels == 'Fxi'):
plt.text(xi+dx, yi+dy, label_i, fontsize = font_size, bbox = dict(facecolor='grey', alpha = 0.1))
elif(labels == 'Fxj'):
plt.text(xj+dx, yj+dy, label_j, fontsize = font_size, bbox = dict(facecolor='grey', alpha = 0.1))
elif(labels == 'Fxi & Fxj'):
plt.text(xi+dx, yi+dy, label_i, fontsize = font_size, bbox = dict(facecolor='grey', alpha = 0.1))
if(n == len(members)-1):
plt.text(xj+dx, yj+dy, label_j, fontsize = font_size, bbox = dict(facecolor='grey', alpha = 0.1))