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Questions - multidimensional-array

Have trouble doing push to a sub-array in a 2D JS array

Suppose I made a 5 by 2 matrix populated by integer 9 let arr = Array(5).fill(Array(2).fill(9)); Now I want to push integer 8 into the fourth line of the matrix by doing arr[3].push(8); I ended up get...
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Yani

javascript

multidimensional-array

Votes: 0

Answers: 1

Latest Answer

Short Answer: This is because all 5 arrays are sharing a reference to the exact same array i.e. Array(2).fill(9) => [9,9] Quick Solution: Use Array.form to create a deep-copy for each layer let arr...
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Momin Bin Shahid

Sort 2D array by matching the last values with the first one in the next index

So basically, I have this array array = [[1,0],[2,1],[0,3],[3,2]] Is there any quick method to convert the array to look like this array = [[0,3],[3,2],[2,1],[1,0]] What I want is for the first elem...
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Vlad Solomon

javascript

arrays

sorting

multidimensional-array

Votes: 0

Answers: 3

Latest Answer

For the example you gave the easiest solution would be to sort the 2d array by the second element of each inner array, as follow: let array = [[1,0],[2,1],[0,3],[3,2]]; array.sort((a, b) => b[1] - ...
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Ariel Rotem

Optimizing array multiplication in fortran

I am trying to optimize the array multiplication of the following type in fortran: do i = 1, n do j = 1, n do k = 1, n do i1 = 1, n do j1 = 1, n do k1 =...
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Djole

loops

multidimensional-array

fortran

Votes: 0

Answers: 1

Latest Answer

You can at the very least reduce two of the loop pairs to matrix multiplication, using either matmul or BLAS/LAPACK, e.g. do i1=1,n do i=1,n B(:,:,i1) = B(:,:,i1) & & + matmu...
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veryreverie

Using strcpy on a 2D char array allocated with malloc

I have a problem, and I cannot figure out the solution for it. I have to programm some code to a µC, but I am not familiar with it. I have to create an analysis and show the results of it on the scree...
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MrByte

c

multidimensional-array

malloc

microcontroller

strcpy

Votes: 0

Answers: 2

Latest Answer

This is all odd, you seem to just want: // array of 100 arrays of 10 chars char g_results[100][10]; for (int i = 0; i < 100, i++) { // why snprintf+strcpy? Just write where you want to write. ...
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KamilCuk

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