What is the meaning of '+-' and 'o-'

I read this code: plot(numTopicsRange,validationPerplexity,'+-') and plot(numTopicsRange,timeElapsed,'o-') but i don't know the meaning of '+-' and 'o-'.

thanks.

Answer 1

[madhan ravi]

https://in.mathworks.com/help/matlab/ref/linespec.html

[atmaja tristya]

Thanks for your help!