plot(x,sin(x),'r','.') command nt showing dotted line
Dotted line in graph not reflected 

Python-3.4.3 Embellishing-a-plot 04-05 min 30-40 sec 23-04-20, 7:59 p.m. meghna_bhatia

Answers:

Try this example

plot(x, sin(x), color='red', linewidth=1, linestyle=':')
24-04-20, 10:15 a.m. iakashchavan

try this 
plot(x,sin(x),'.r') 
19-06-20, 1:19 p.m. mdaipayan1986

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