concatenation

Concatenation of strings in Lua

試著忘記壹切 提交于 2019-12-02 17:23:41
In many languages you can concatenate strings on variable assignment. I have a scenario, using the Lua programming language, where I need to append the output of a command to an existing variable. Is there a functional equivalent in Lua to the below examples? Examples of other languages: ===== PERL ===== $filename = "checkbook"; $filename .= ".tmp"; ================ ===== C# ===== string filename = "checkbook"; filename += ".tmp"; =============== Thank you in advance for your help. RBerteig As other answers have said, the string concatenation operator in Lua is two dots. Your simple example

How can I merge together several pandas dataframes on a certain column without 'pandas.merge'?

和自甴很熟 提交于 2019-12-02 16:55:49
问题 I often find myself with several pandas dataframes in the following form: import pandas as pd df1 = pd.read_table('filename1.dat') df2 = pd.read_table('filename2.dat') df3 = pd.read_table('filename3.dat') print(df1) columnA first_values name1 342 name2 822 name3 121 name4 3434 print(df2) columnA second_values name1 8 name2 1 name3 1 name4 2 print(df3) columnA third_values name1 910 name2 301 name3 132 name4 299 I would like to merge together each of these dataframes on 'columnA', giving

Append an array to another array in JavaScript [duplicate]

故事扮演 提交于 2019-12-02 16:54:19
This question is an exact duplicate of: How to append an array to an existing JavaScript Array? How do you append an array to another array in JavaScript? Other ways that a person might word this question: Add an array to another Concat / Concatenate arrays Extend an array with another array Put the contents of one array into another array I spent some time looking for the answer to this question. Sometimes the simplest ones like these are the hardest to find answers to, so I am adding the question here hopefully with plenty of key words and phrases as per this blog post . Please feel free to

Gulp.js event stream merge order

扶醉桌前 提交于 2019-12-02 16:15:46
I am trying to merge css and scss files into a main.css file that goes in my build directory. Its working, but not in the right order. The style attributes from the scss files need to be in the bottom of the main.css file so they overrule the rest. my Gulp task looks like this: //CSS gulp.task('css', function () { var cssTomincss = gulp.src(['dev/css/reset.css', 'dev/css/style.css','dev/css/typography.css', 'dev/css/sizes.css']); var cssFromscss = gulp.src(['dev/css/*.scss']) .pipe(sass()); return es.merge(cssTomincss, cssFromscss) .pipe(concat('main.css')) .pipe(minifyCSS()) .pipe(gulp.dest(

How do I concatenate the string elements of my array into a single string in C?

Deadly 提交于 2019-12-02 14:51:42
I have an array of strings and I would like to create a new string that is a concatenation of all the array elements. Any help is appreciated, thanks #include <stdio.h> #include <stdlib.h> #include <string.h> char *concatenate(size_t size, char *array[size], const char *joint){ size_t jlen, lens[size]; size_t i, total_size = (size-1) * (jlen=strlen(joint)) + 1; char *result, *p; for(i=0;i<size;++i){ total_size += (lens[i]=strlen(array[i])); } p = result = malloc(total_size); for(i=0;i<size;++i){ memcpy(p, array[i], lens[i]); p += lens[i]; if(i<size-1){ memcpy(p, joint, jlen); p += jlen; } } *p

PHP concatenation

主宰稳场 提交于 2019-12-02 14:35:53
I am trying to get into some PHP and I can't seem to figure out the following. I can create a string by means of PHP with concatenation: echo 'This ' . 'string ' . 'was ' . 'made ' . 'with concatenation.' . "\n"; But what if you want to do this with a variable? (I am guessing WP's functions can be called variables.) I am quite lost here. The following does not work. Or at least, my text editor throws an unknown error. <?php if ( is_404() ) { echo "<script src='" . get_stylesheet_directory_uri(); . "/sm/script/soundmanager2-nodebug-jsmin.js'></script> <script> soundManager.setup({ url: '" . get

understanding numpy's dstack function

无人久伴 提交于 2019-12-02 14:18:35
I have some trouble understanding what numpy's dstack function is actually doing. The documentation is rather sparse and just says: Stack arrays in sequence depth wise (along third axis). Takes a sequence of arrays and stack them along the third axis to make a single array. Rebuilds arrays divided by dsplit . This is a simple way to stack 2D arrays (images) into a single 3D array for processing. So either I am really stupid and the meaning of this is obvious or I seem to have some misconception about the terms 'stacking', 'in sequence', 'depth wise' or 'along an axis'. However, I was of the

go one step back and one step forward in a loop with python

落爺英雄遲暮 提交于 2019-12-02 14:13:32
问题 I need to loop in a list containing french words and find an asterisk because I want to concatenate the word before the asterisk and the word after the asterisk each time an asterisk appear and continue to the next. For example, in the sequence: ['les','engage', '*', 'ment', 'de','la'] I want to concatenate 'engage' and 'ment' and the output (engagement) should be checked by a dictionary. If in the dictionary, append to a list. With my code I only get the asterisk: import nltk from nltk

Need to combine lots of files in a directory

浪尽此生 提交于 2019-12-02 14:06:43
I've got 50 to 60 files in a directory that I need to concatenate into a single file on a regular basis. I thought about using notepad++ thinking there was probably a plug-in that would help but haven't been able to find one. Any other thoughts? Assuming these are text files (since you are using notepad++) and that you are on Windows, you could fashion a simple batch script to concatenate them together. For example, in the directory with all the text files, execute the following: for %f in (*.txt) do type "%f" >> combined.txt This will merge all files matching *.txt into one file called

How to concatenate multiple structure results vertically?

此生再无相见时 提交于 2019-12-02 14:04:54
问题 If I have structure array and access it with matrix index, I get multiple anses. >> a=struct([]) a = 0x0 struct array with no fields. >> a(1).f1=[1;2] a = f1: [2x1 double] >> a(2).f1=[1;2;3] a = 1x2 struct array with fields: f1 >> a([1 2]).f1 ans = 1 2 ans = 1 2 3 What is the nature of this result? Can I generate it in other way? For example, may I write my own function or procedure, which will return such a result? Why assignment of this result gives first element, not last like in lists? >>