Hypobolic Tangent Function Question

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I am a beginner with Matlab. I am trying to create a .m file that will plot a function for me. There are other parts to what I want to plot, but my problem is apparently something with plotting a hyperbolic tangent function that is in the denominator of a fraction. Here is a simplified version of my script:

y=-3:0.01:3; f=1/tanh(y) plot(y,f)

I keep getting an error on the second line. When I define other functions for "f" I get a plot, but I can't get the hyperbolic tangent function in the denominator to plot. Could someone please tell me what is wrong with my script?

Thanks, Allen