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Error: could not find function … in R
...lly run a script that just loads every package needed and does some little test. This catches the package issue as early as possible in the workflow. This is akin to build testing or unit testing, except it's more like a smoke test to make sure that the very basic stuff works.
If packages can be s...
Why isn't my Pandas 'apply' function referencing multiple columns working? [closed]
...got the '' of your string.
In [43]: df['Value'] = df.apply(lambda row: my_test(row['a'], row['c']), axis=1)
In [44]: df
Out[44]:
a b c Value
0 -1.674308 foo 0.343801 0.044698
1 -2.163236 bar -2.046438 -0.116798
2 -0.199115 foo -...
How to use NSURLConnection to connect with SSL for an untrusted cert?
...d to accept an un-trusted certificate.
Scenario A: You are connected to a test environment which is using a self-signed certificate.
Scenario B: You are Proxying HTTPS traffic using a MITM Proxy like Burp Suite, Fiddler, OWASP ZAP, etc. The Proxies will return a certificate signed by a self-signed...
Undo changes in entity framework entities
... Not following you - performance of disposing and recreating connection. I tested it on existing project and it finished somewhat faster then above Rollback procedure, which makes it far better choice if one wants to revert entire database state. Rollback could cherry pick tho.
...
How to get UITableView from UITableViewCell?
...archy changes or reverts in the future it will show up immediately in your tests.
Solution #2: Add a Weak UITableView reference to UITableViewCell
@interface SOUITableViewCell
@property (weak, nonatomic) UITableView *tableView;
@end
This is a much better design, though it will require a bi...
How can I run a program from a batch file without leaving the console open after the program starts?
...ance, this batch-file will wait until notepad exits:
@echo off
notepad c:\test.txt
However, this won't:
@echo off
start notepad c:\test.txt
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Why is null an object and what's the difference between null and undefined?
...undefined, null
Booleans: false
Numbers: +0, -0, NaN
Strings: ""
You can test the conversion to boolean by using Boolean as a function (normally it is a constructor, to be used with new):
> Boolean(null)
false
> Boolean("")
false
> Boolean(3-3)
false
> Boolean({})
true
> Boolean([]...
How to know if two arrays have the same values
...
Array.prototype.compare = function(testArr) {
if (this.length != testArr.length) return false;
for (var i = 0; i < testArr.length; i++) {
if (this[i].compare) { //To test values in nested arrays
if (!this[i].compare(testArr[i])) ...
angular js unknown provider
...
In my case, I've defined a new provider, say, xyz
angular.module('test')
.provider('xyz', function () {
....
});
When you were to config the above provider, you've to inject it with Provider string appended --> xyz becomes xyzProvider.
Ex:
angular.module('App', ['test'])
.config...
c# datatable to csv
...rray();
sb.AppendLine(string.Join(",", fields));
}
File.WriteAllText("test.csv", sb.ToString());
.net >= 4.0
And as Tim pointed out, if you are on .net>=4, you can make it even shorter:
StringBuilder sb = new StringBuilder();
IEnumerable<string> columnNames = dt.Columns.Cast&l...