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How do I return multiple values from a function in C?
...r *s, int size);
and call it like this:
int a;
char *s = (char *)malloc(100); /* I never know how much to allocate :) */
foo(&a, s, 100);
In general, prefer to do the allocation in the calling function, not inside the function itself, so that you can be as open as possible for different all...
In-place type conversion of a NumPy array
...ethod, but proceed in block sizes that are within your memory limits:
a[0:10000] = a[0:10000].astype('float32').view('int32')
...then change the dtype when done.
Here is a function that accomplishes the task for any compatible dtypes (only works for dtypes with same-sized items) and handles arbi...
How do you change the size of figures drawn with matplotlib?
...plot.gcf()
fig.set_size_inches(18.5, 10.5)
fig.savefig('test2png.png', dpi=100)
To propagate the size change to an existing gui window add forward=True
fig.set_size_inches(18.5, 10.5, forward=True)
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jQuery get the location of an element relative to window
... ")");
});
#simplebox{
width:150px;
height:100px;
background: #FBBC09;
margin: 150px 100px;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<button type="button">Get Box Position<...
Why does Java switch on contiguous ints appear to run faster with added cases?
... ; - javaapplication4.Test1::multiplyByPowerOfTen@278 (line 100)
; {section_word}
0x0000000002524611: jmp 0x0000000002524744
0x0000000002524616: mulsd xmm0,QWORD PTR [rip+0xfffffffffffffdfa] # 0x0000000002524418
...
pandas: filter rows of DataFrame with operator chaining
...ort numpy as np
import pandas as pd
df = pd.DataFrame(np.random.randint(0,100,size=(100, 4)), columns=list('ABCD'))
df.loc[lambda df: df.A == 80] # equivalent to df[df.A == 80] but chainable
df.sort_values('A').loc[lambda df: df.A > 80].loc[lambda df: df.B > df.A]
If all you're doing is f...
如何建立一套适合自己的高胜算交易系统 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...成败。
2:得失核心
不同的资金起点，有不同的得失。如100万与3万，年一倍，其交易次序是一致的，但掌握100万的个体，其将收益目标降低到年50%，其收益高于3万翻倍许多，其心理要求和技术要求就会大幅度的降低。因此，导...
Identify duplicates in a List
... to consider the load factor, e.g. when you specify an initial capacity of 100, because you want to add that number of elements, it gets rounded to the next power of 2 (128), which implies that with the default load factor of 0.75f, the resize threshold will be 96, so there will be a resize before y...
Make function wait until element exists
...) {
console.log("Exists!");
clearInterval(checkExist);
}
}, 100); // check every 100ms
But note - many times 3rd party code has an option to activate your code (by callback or event triggering) when it finishes to load. That may be where you can put your function. The interval solu...
Dump a NumPy array into a csv file
...ne
with open('example.csv', 'w') as fp:
fp.write('''\
col1,col2,col3
1,100.1,string1
2,222.2,second string
''')
# Read it as a Numpy record array
ar = np.recfromcsv('example.csv')
print(repr(ar))
# rec.array([(1, 100.1, 'string1'), (2, 222.2, 'second string')],
# dtype=[('col1', '<...