What is the cause? Bottom Line You are trying to use something that is null (or Nothing in VB.NET). This means you either set it to null, or you never set it to anything at all. Like anything else, null gets passed around. If it is null in method “A”, it could be that method “B” passed a null to method “A”. null can have different meanings: Object variables … Read more
Simplest way I can think of doing it is: For safety, you might prefer: or could be in this fashion:
Ignore the people that are suggesting that the property name is the issue. The jQuery API documentation explicitly states that either notation is acceptable: http://api.jquery.com/css/ The actual problem is that you are missing a closing curly brace on this line: Change it to this: Here’s a working demo: http://jsfiddle.net/YPYz8/
Note that there is no standard C API for milliseconds, so (on Unix) you will have to settle for usleep, which accepts microseconds:
It means that somewhere in your code, you are calling a function which in turn calls another function and so forth, until you hit the call stack limit. This is almost always because of a recursive function with a base case that isn’t being met. Viewing the stack Consider this code… Here is the stack … Read more
EDIT: I put together this answer off and on over a couple of hours, so I missed your latest edits indicating that you only needed curvature. Hopefully, this answer will be helpful regardless. Other than doing some curve-fitting, our method of approximating derivatives is via finite differences. Thankfully, numpy has a gradient method that does these difference calculations for us, … Read more
you have defined the public dir in app root/public so you have to use:
I figured out how to do it. I post the solution in case someone else has the same problem. You just need to access https://visualstudio.microsoft.com/vs/older-downloads/ and If you get the same message than me, just join to the Visual Studio Dev Essentials (in the same page is a link to do it), it is free, and then … Read more
os.listdir() will get you everything that’s in a directory – files and directories. If you want just files, you could either filter this down using os.path: or you could use os.walk() which will yield two lists for each directory it visits – splitting into files and dirs for you. If you only want the top directory you can break the first time it yields or, shorter:
The simplest way would be to use the native Number function: If that doesn’t work for you, then there are the parseInt, unary plus, parseFloat with floor, and Math.round methods. parseInt: unary plus if your string is already in the form of an integer: if your string is or might be a float and you want an integer: or, if you’re going … Read more