Robotbugs
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 Aug 14 comment Derivative of the squared $L^2$ norm of a vector function If I wanted $\frac{\partial}{\partial w_i}$ where $w_i$ is an element of $w$ does that make it clearer? I'm confused about the result being an operator. Aug 14 comment Derivative of the squared $L^2$ norm of a vector function This looks promising but I'm a little confused by the terminology. By $\langle -,w\rangle$ do you mean the inner product of $w$ with something unknown? I guess I'm still confused as to how the two partial results tie together in your terminology. Aug 8 comment What's the best way to optimize this energy function, and is it convex? The answer is useful in that the author provides information about the L1 approach, but I see what you mean about the non-convexity. Mar 15 comment Finding a good difficult example function to minimize Shame you didn't put those in an answer. Great pointer! Mar 15 comment Finding a good difficult example function to minimize Ooh thats pretty good... Mar 3 comment What is the intuitive relationship between SVD and PCA This was a little confusing in that normally the data matrix has n rows of samples of data with d dimensions along columns, like a least squares design matrix. If that is true then the covariance is $X^TX$, and the SVD result is $V\Sigma V^T$. I was also confused by the lack of normalization initially. But altogether a pretty clear explanation. Mar 5 comment Finding a simple spline-like interpolating function OK well you'll be pleased to know that your answer is now incorporated into my iPad app. Mar 5 comment Finding a simple spline-like interpolating function Actually my previous statement was false as I realize that introduces a singularity at $\alpha = 0.5$. (Its amazing how little appears on a screen when you have Infs in a vertex shader.) And I guess robotbugs could be both:) Mar 5 comment Finding a simple spline-like interpolating function OK thats great because its just $\frac{kx}{x+c}$ which is very few math operations. I can precompute the two constants. Mar 5 comment Finding a simple spline-like interpolating function You have a mix of $k$ and $x$ in there. Are they supposed to be the same variable? Mar 5 comment Finding a simple spline-like interpolating function Also what did you use to display such a nice graph on here? I was wondering how to get a diagram in my original post. Last time I tried to post something though I did not have enough standing on the forum to post images. Mar 5 comment Finding a simple spline-like interpolating function Thanks, thats exactly the form of curve I was looking for. I can certainly live with a square root function. Many thanks! Mar 5 comment Finding a simple spline-like interpolating function I'm currently using code: if(d