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Undefined reference to symbol X509_free - C/C++ - 清泛网 - 专注C/C++及内核技术
Undefined reference to symbol X509_freeundefined-reference-to-symbol-x509-freeUndefined reference to symbol X509_free 编译错误的解决方法：链接库中增加 -lcrypto，而非 -lcrypt参考：https: stackoverflow com questions 33215936 undefined-reference-to-symbol-x509-freeUndefined refer...
Update a dataframe in pandas while iterating row by row
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I'm not sure if we read it exactly the same. If you look in my pseudo code I do the modification on the dataframe, not on the value from the iterator. The iterator value is only used for the index of the value/object. What will fail is row['ifor']=some_...
How to normalize an array in NumPy?
...ormalize:
import numpy as np
from sklearn.preprocessing import normalize
x = np.random.rand(1000)*10
norm1 = x / np.linalg.norm(x)
norm2 = normalize(x[:,np.newaxis], axis=0).ravel()
print np.all(norm1 == norm2)
# True
sha...
Awaiting multiple Tasks with different results
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@Sergey: The tasks begin executing immediately. E.g., catTask is already running by the time it's returned from FeedCat. So either approach will work - the only question is whether you want to await them one at a time or all together. The error handli...
Getting the current page
...rent page. You can calculate it with:
int page = scrollView.contentOffset.x / scrollView.frame.size.width;
If you want to round up or down to the nearest page, use:
CGFloat width = scrollView.frame.size.width;
NSInteger page = (scrollView.contentOffset.x + (0.5f * width)) / width;
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How to prevent ifelse() from turning Date objects into numeric objects
I am using the function ifelse() to manipulate a date vector. I expected the result to be of class Date , and was surprised to get a numeric vector instead. Here is an example:
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How to make rounded percentages add up to 100%
...function foo(l, target) {
var off = target - _.reduce(l, function(acc, x) { return acc + Math.round(x) }, 0);
return _.chain(l).
sortBy(function(x) { return Math.round(x) - x }).
map(function(x, i) { return Math.round(x) + (off > i) - (i >= (l.length + off)) })....
Can you detect “dragging” in jQuery?
...s drags on the "a" element. Just look for a certain amount of change in an x and y mousemove event.
– Ash Blue
May 21 '14 at 23:45
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How can one see content of stack with GDB?
...rame info
To read the memory at given addresses you should take a look at x
x/x $esp for hex x/d $esp for signed x/u $esp for unsigned etc. x uses the format syntax, you could also take a look at the current instruction via x/i $eip etc.
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Why does Double.NaN==Double.NaN return false?
... returns false and any != comparison involving NaN returns true, including x!=x when x is NaN.
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