pi doesn't work in diff()

[acttmer]

For example, derivative of x^2pi should be 2pix, but this lib will give a result x^2.
It seems that in diff() pi is not supported.

[jiggzson]

The problem is that you're more than likely not telling nerdamer with respect to which variable it's supposed to differentiate. In this case nerdamer should detect that pi is a constant since in version 6.0 and up this is the case but I haven't done so yet. Here it tries to assume you mean the first variable and since pi come before x, it's with respect to pi. To avoid this pass in the variable as the second argument so in your case

var x = nerdamer('diff(x^2*pi, x)');

[acttmer]

Now I got it. This is a great project, thank for your effort again!

[jiggzson]

No problem. Thanks!