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How to find all combinations of coins when given some dollar value
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I looked into this once a long time ago, and you can read my little write-up on it. Here’s the Mathematica source.
By using generating functions, you can get a closed-form constant-time solution to the problem. Graham, Knuth, and Patashnik’s Concrete Mathematic...
Reading a huge .csv file
...ying to read data from .csv files in Python 2.7 with up to 1 million rows, and 200 columns (files range from 100mb to 1.6gb). I can do this (very slowly) for the files with under 300,000 rows, but once I go above that I get memory errors. My code looks like this:
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Lazy Method for Reading Big File in Python?
I have a very big file 4GB and when I try to read it my computer hangs.
So I want to read it piece by piece and after processing each piece store the processed piece into another file and read next piece.
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Post data to JsonP
...y works because you're allowed to insert <script> tags into the DOM, and they can point anywhere.
You can, of course, make a page on another domain the action of a regular form POST.
Edit: There are some interesting hacks out there if you're willing to go to a lot of effort inserting hidden ...
How to tell when UITableView has completed ReloadData?
...nvestigation, I find that the table view sends tableView:numberOfSections: and tableView:numberOfRowsInSection: to its data source before returning from reloadData. If the delegate implements tableView:heightForRowAtIndexPath:, the table view also sends that (for each row) before returning from rel...
Is it possible to use JavaScript to change the meta-tags of the page?
If I put a div in the head and display:none, than use JavaScript to display it, will this work?
17 Answers
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Not able to access adb in OS X through Terminal, “command not found”
I have installed Android SDK and Eclipse on my Mac system. I am able to program using Eclipse and have created few sample applications. But I am still not able to access adb through the terminal window. I have tried following command in terminal:
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Reducing Django Memory Usage. Low hanging fruit?
My memory usage increases over time and restarting Django is not kind to users.
10 Answers
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How do you round UP a number in Python?
...reats the input as a float (Python does not have strongly-typed variables) and the function returns a float. If you want an int, you can construct an int from the return value, i.e., int(math.ceil(363))
– R. W. Sinnet
Aug 26 '15 at 23:37
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How do I convert NSMutableArray to NSArray?
...ons. For example sending copy to a immutable array only retains the object and returns self.
If you don't use garbage collection or ARC remember that -copy retains the object.
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