why is it happen?

when i plot figure with 3 or 4 curves, it appears the same line style.

Answer 1

[madhan ravi]

"why is it happen?"

Obviously you have used the same linestyle inside the loop use the below way to distinguish:

c={'-*m','-^k','-or','-sq'} % use different markers to distinguish
plot(..,c{i}) % inside loop
        ^^^^-should be in the place of line style

[shreen elsapa]

I used different markers,but when i reduce step give me different with curves not smooth

as attach

[madhan ravi]

Nothing can be done with the screenshot upload your code