variable-length

How to find the length of a “filter” object in python

由 我只是一个虾纸丫 提交于 2019-12-18 10:58:45
问题 >>> n = [1,2,3,4] >>> filter(lambda x:x>3,n) <filter object at 0x0000000002FDBBA8> >>> len(filter(lambda x:x>3,n)) Traceback (most recent call last): File "<pyshell#3>", line 1, in <module> len(filter(lambda x:x>3,n)) TypeError: object of type 'filter' has no len() I could not get the length of the list I got. So I tried saving it to a variable, like this... >>> l = filter(lambda x:x>3,n) >>> len(l) Traceback (most recent call last): File "<pyshell#5>", line 1, in <module> len(l) TypeError:

How do I create a variable-length input LSTM in Keras?

由 馋奶兔 提交于 2019-12-17 17:27:04
问题 I am trying to do some vanilla pattern recognition with an LSTM using Keras to predict the next element in a sequence. My data look like this: where the label of the training sequence is the last element in the list: X_train['Sequence'][n][-1] . Because my Sequence column can have a variable number of elements in the sequence, I believe an RNN to be the best model to use. Below is my attempt to build an LSTM in Keras: # Build the model # A few arbitrary constants... max_features = 20000 out

Matrix of unknown length in MATLAB?

由 谁都会走 提交于 2019-12-17 01:02:23
问题 I'm trying to set up a zero matrix of variable length with two columns into which I can output the results of a while loop (with the intention of using it to store the step data from Euler's method with adjusted time-steps). The length will be determined by the number of iterations of the loop. I'm wondering if there's a way I can do this while I'm running the loop or whether I need to set it up to begin with, and how to go about doing that. 回答1: if the number of columns is fixed you can

plm error variable lengths differ

由 空扰寡人 提交于 2019-12-11 19:49:46
问题 I'm completely new to R, and I'm trying to run an unbalanced fixed effects model using plm. I'm not sure if this question has been answered as most of the answers on this web site are beyond my technological grasp. My data is set up in five columns, Year, Country, Var1, Var2, and Var3. The Var3 column is missing data sporadically. My goal is to regress Var1 for a country-year observation on the Var2, Var3, and an interaction; with country fixed effects. The missing Var 3 data is blank, no n/a

How to create a variadic (with variable length argument list) function wrapper in JavaScript

由 流过昼夜 提交于 2019-12-11 09:56:15
问题 The intention is to build a wrapper to provide a consistent method of calling native functions with variable arity on various script hosts - so that the script could be executed in a browser as well as in the Windows Script Host or other script engines. I am aware of 3 methods of which each one has its own drawbacks. eval() method: function wrapper () { var str = ''; for (var i=0; i<arguments.lenght; i++) str += (str ?', ':'') + ',arguments['+i+']'; return eval('[native_function] ('+str+')');

Finding length of all arrays multidimensional array, Java

由 家住魔仙堡 提交于 2019-12-10 03:52:36
问题 I would like to use a multidimensional array to store a grid of data. However, I have not found a simple way to find the length of the 2nd part of the array. For example: boolean[][] array = new boolean[3][5]; System.out.println(array.length); will only output 3 . Is there another simple command to find the length of the second array? (i.e. output 5 in the same manner) 回答1: Try using array[0].length , this will give the dimension you're looking for (since your array is not jagged). 回答2:

Node.JS convert Variable-length binary data to jpeg or png?

由 末鹿安然 提交于 2019-12-08 10:36:10
问题 I was wondering how to convert Variable-length binary data ( 255216255224016747073700110010100255 ) to a jpeg or png to the web browser? Example Code: var Connection = require('tedious').Connection; var config = { "userName": "user@server.database.windows.net", "password": "pswd", "server": "server.database.windows.net", "options": { "database": "db", "encrypt": true, } }; var connection = new Connection(config); connection.on('connect', function(err) { console.log("Connected"); } ); var

What does (int (*)[])var1 stand for?

由 六月ゝ 毕业季﹏ 提交于 2019-12-06 22:40:12
问题 I found this example code and I tried to google what (int (*)[])var1 could stand for, but I got no usefull results. #include <unistd.h> #include <stdlib.h> int i(int n,int m,int var1[n][m]) { return var1[0][0]; } int example() { int *var1 = malloc(100); return i(10,10,(int (*)[])var1); } Normally I work with VLAs in C99 so I am used to: #include <unistd.h> #include <stdlib.h> int i(int n,int m,int var1[n][m]) { return var1[0][0]; } int example() { int var1[10][10]; return i(10,10,var1); }

Array length undefined [closed]

由 放肆的年华 提交于 2019-12-04 07:13:16
问题 This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center. Closed 7 years ago . I'm trying to get the length of a multidimensional Array as follows, but when I test it with alert() I get undefined. I would like to know how many items

len() of a numpy array in python [duplicate]

由 醉酒当歌 提交于 2019-12-04 06:21:19
This question already has an answer here: Numpy array dimensions 7 answers If I use len(np.array([[2,3,1,0], [2,3,1,0], [3,2,1,1]])) , I get back 3. Why is there no argument for len() about which axis I want the length of in multidimensional arrays? This is alarming. Is there an alternative? What is the len of the equivalent nested list? len([[2,3,1,0], [2,3,1,0], [3,2,1,1]]) With the more general concept of shape , numpy developers choose to implement __len__ as the first dimension. Python maps len(obj) onto obj.__len__ . X.shape returns a tuple, which does have a len - which is the number of
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