I'm not sure which variable you are referring to with ans = 0.03. But to get a plot, you need to include a non-zero value for the third input variable for the function. Also, the plot will only be created if the significance is below your specified threshold. I hope this helps.
bro , I am new to matlab and thus could not able to figure out how to weed out the error mentioned below
Error: File: taub.m Line: 148 Column: 1
Function definitions are not permitted in this context.
help me out