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Changing undefined values of an array


Changing undefined values of an array

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Changing undefined values of an array
Tag : c , By : foxthrot
Date : November 25 2020, 01:01 AM


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Changing specific values in a numpy array with += using values from a different array via an index list


Tag : python , By : boney M
Date : March 29 2020, 07:55 AM
seems to work fine The operation you're looking for is numpy.add.at. Crucially, this does an unbuffered addition at the indicies specified, whereas F[i] += f uses an internal buffer.
However, ufunc.at is notorious for being non-optimal. If your arrays are sufficiently large and rectangular, it might be worth to do a small loop and use bincount. Example timings:
In [43]: n = 10**5
    ...: m = 10**6
    ...: I = np.random.randint(n, size=m)
    ...: f = np.random.rand(m, 3)

In [44]: %%time
    ...: F = np.zeros((n, 3))
    ...: np.add.at(F, I, f)
Wall time: 624 ms

In [45]: %%time
    ...: F2 = np.zeros((n, 3))
    ...: for dim in range(3):
    ...:     F2[:,dim] += np.bincount(I, f[:,dim], n)t
Wall time: 94 ms

In [46]: np.allclose(F, F2)
Out[46]: True

reactjs: state properties are undefined after changing values


Tag : reactjs , By : dormsbee
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further You can only handle the change of one input at a time. Here is the problem code:
this.setState({ un: event.target.un, pw: event.target.pw });
<input name="un" value={this.state.un} onChange={this.handleChange} />
<input name="pw" value={this.state.pw} onChange={this.handleChange} />
this.setState({ [event.target.name]: event.target.value });

How to pass an array to a function so that the original array's value doesn't change when changing the array's values in


Tag : cpp , By : potix2
Date : March 29 2020, 07:55 AM
around this issue
Is there any way to pass the array to a function so that the original array does not get changed while performing any operation in the function?

Else if statement changing array item to undefined


Tag : javascript , By : Killercode
Date : March 29 2020, 07:55 AM
around this issue You're showing two lines being logged by console.log(dataSplit). The first line has the expected 23 fields, but the second line is just an empty string. When you split the empty string, you get an array containing a single empty string, ['']. Your problem is happening when you process the second line.
The first test if (dataSplit[1] === '') fails because there is no dataSplit[1]. Then it does if (dataSplit[7] !== "Yes"). Since there is no dataSplit[7], its value is undefined. The test succeeds, and then it logs undefined.
if (lineArray[i].trim() === "") {
    continue;
}

Is undefined behavior changing a literal array?


Tag : c , By : amorican
Date : March 29 2020, 07:55 AM
should help you out
I'd like to know if the two labeled situations are undefined behaviors or not. I believe that situation 1 is not a undefined behavior (once I use data only inside f),
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