I have two simple one-dimensional arrays in NumPy. I should be able to concatenate them using numpy.concatenate. But I get this error for the code below: TypeError: only length-1 arrays can be converted to Python scalars Code import numpy a = numpy.array([1, 2, 3]) b = numpy.array([5, 6]) numpy.concatenate(a, b) Why? 6 Answers 6
This question already has answers here: Making a string out of a string and an integer in Python [duplicate] (6 answers) Closed 5 years ago. I want to create a string using an integer appended to it, in a for loop. Like this: for i in range(1, 11): string = “string” + i But it … Read more
Is there any difference between ::: and ++ for concatenating lists in Scala? scala> List(1,2,3) ++ List(4,5) res0: List[Int] = List(1, 2, 3, 4, 5) scala> List(1,2,3) ::: List(4,5) res1: List[Int] = List(1, 2, 3, 4, 5) scala> res0 == res1 res2: Boolean = true From the documentation it looks like ++ is more general … Read more
I’m working in C, and I have to concatenate a few things. Right now I have this: message = strcat(“TEXT “, var); message2 = strcat(strcat(“TEXT “, foo), strcat(” TEXT “, bar)); Now if you have experience in C I’m sure you realize that this gives you a segmentation fault when you try to run it. … Read more
I wanted to add the elements of an array into another, so I tried this: [1,2] + [3,4] It responded with: “1,23,4” What is going on? 13 Answers 13
Basically the question is how to get from this: foo_id foo_name 1 A 1 B 2 C to this: foo_id foo_name 1 A B 2 C 6 Answers 6
Since Python’s string can’t be changed, I was wondering how to concatenate a string more efficiently? I can write like it: s += stringfromelsewhere or like this: s = [] s.append(somestring) # later s=””.join(s) While writing this question, I found a good article talking about the topic. http://www.skymind.com/~ocrow/python_string/ But it’s in Python 2.x., so the … Read more
I would like to concatenate a number of text files into one large file in terminal. I know I can do this using the cat command. However, I would like the filename of each file to precede the “data dump” for that file. Anyone know how to do this? what I currently have: file1.txt = … Read more
Assuming String a and b: a += b a = a.concat(b) Under the hood, are they the same thing? Here is concat decompiled as reference. I’d like to be able to decompile the + operator as well to see what that does. public String concat(String s) { int i = s.length(); if (i == 0) … Read more
I have a script that prints the current date and time in JavaScript, but the DATE is always wrong. Here is the code: var currentdate = new Date(); var datetime = “Last Sync: ” + currentdate.getDay() + “/” + currentdate.getMonth() + “/” + currentdate.getFullYear() + ” @ ” + currentdate.getHours() + “:” + currentdate.getMinutes() + … Read more
