Software which opens PSD files correctly on Ubuntu?

Software which opens PSD files correctly on Ubuntu?

I am stuck in trying to find a software which can render PSD files
properly under Ubuntu. I have tried GIMP and Krita but they both have
problems with that - especially the clipping mask functionality.
Is there a working solution for Ubuntu?

Why does $\frac{d}{d\theta} \theta\prod_{i=1}^nx_i = \sum_{i=1}^nx_i$

Why does $\frac{d}{d\theta} \theta\prod_{i=1}^nx_i = \sum_{i=1}^nx_i$

Is this just the product rule? I have this in my notes but I didn't think
anything of it and now I'm wondering how this happens?
Edit: Im working with maximum likelihood estimation and in my notes I have
that the likelihood funciton $=L(x;\theta)=\prod_{i=1}^nf(x;\theta)$ where
$x$ is the variable and $\theta$ is the parameter of a probability
distribution. To estimate I was told that we take the log of the
likelihood function e.i. $ln(L)$, then take it's derivative to estimate
the parameter. The function I'm working with is $f(x;\theta)=(\theta
+1)x^{\theta}$. So $$L(x;\theta)=\prod_{i=1}^n(\theta
+1)x_i^{\theta}=(\theta+1)^n\prod_{i=1}^nx_i^{\theta}$$ Now
$$ln(L(x;\theta))=n*ln(\theta+1)+\theta
ln\left(\prod_{i=1}^nx_i\right)$$Here's where I'm confused, I have in my
notes that $$\frac{dL}{d\theta}=\frac{n}{\theta+1}+\sum_{i=1}^nln(x_i)$$
Why does the product of $x_i$ become the summation of $x_i$?

How to test your client server program

How to test your client server program

I'm making a multiplayer game and often i want to test out if it perfectly
works on global network, because sometime it's just works locally, so how
could i do that without sending my client to friend to test it out.

Authenticate API-access against URL parameter instead of Authorization-header

Authenticate API-access against URL parameter instead of Authorization-header

I'm are using WSO2 API Manager for managing our public API's. I now have
the case where an external party wants to consume an API but only has the
ability to specificy a URL, no Authorization/OAuth headers can be added.
Is there a way to let the API Gateway authenticate against a URL-parameter
instead of the Authorization header?

VirtualBox Open Virtual Disk dialog on Mac is Hidden behind Storage Dialog

VirtualBox Open Virtual Disk dialog on Mac is Hidden behind Storage Dialog

I am trying to load an existing VMDK for VBox running on Mac Mountain Lion.
In the screenshot below we can see three relevant dialog boxes open:
The "parent" Storage dialog
The child "Please choose a virtual hard drive" dialog
Mostly hidden! The directory navigation/ Finder dialog In the screenshot
it is 90% obscured by the Storage dialog. We can barely see a bit of its
right side peeking through. That is a serious bug/problem.
The number 3 took me quite a while to realize what was happening: the
other dialogs naturally are not responding since the 3rd mostly hidden is
a modal dialog.
Anyone encountered this / determined a workaround?
I intended to put this on superuser. How can this be migrated to that sit?

Two elements with the same id, want to select one contained in a specific div

Two elements with the same id, want to select one contained in a specific div

I have something like this
<div id='container0'>
<input id='item0'>
</div>
<div id='container1'>
<input id='item0'>
</div>
I want to select the second item0 (the one in div container1) and change
it's id to item1. Best way to do this? Is there a way I can select all
item0's on a page and then check their container div and make sure it
matches to 'container1'?
Thank you for your time.

I can't create apache derby DB in worklight 6.0

I can't create apache derby DB in worklight 6.0

I upgraded to worklight 6.0. I added both derby_core_plugin_10_8_2,
derby_iu_doc_plugin_1.1.3, into eclipse-->plugins I restarted Eclipse and
right click my project to add Apache Derby nature...nothing seems to
happened, then I tried to go directly to server/java-->apache derby--> run
SQL Script using "ij"...I get (the selected project does not have Apache
derby nature please add it and try again)