Hey all. I'm working on a school project where I have to plot a normal bivariate normal distribution with various correlation coefficients in MATLAB. I was given that the means are 0, the standard deviations are 1, and the correlation coefficients should be 0.9, -0.9, 0.5, and 0. I'm having a hard time understanding this concept and visualizing the graph. I have an idea what the graph should look like, but I am unable to fully understand the effect of the standard deviation onto the graph. I assume the smaller the standard deviation, the tighter ("narrower"?) the ridge will be? But using the mvnpdf function in MATLAB, there is no standard deviation parameter? Any ideas?
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