What is the in-place transposing of a matrix in C?

In the context of programming and data manipulation, “in-place” means that the operation is done directly on the data structure itself, without needing to create a new copy of the data.

For example, in the transpose() function in your code, the array is transposed “in-place”. This means that the elements of the original array are swapped within the array itself to create the transposed array. No additional array is created to hold the transposed matrix. This is more memory-efficient, especially for large arrays, as it does not require additional memory proportional to the size of the array.

In contrast, a not-in-place (or out-of-place) operation would involve creating a new data structure (like a new array), performing the operation on the original data structure, and storing the result in the new data structure. While this can sometimes be simpler or safer (since it doesn’t modify the original data), it can also be more memory-intensive, especially for large data structures.

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//Code snippet

void transpose(int n, int arr[n][n]) {
for (int i = 0; i < n; i++) {
for (int j = i+1; j < n; j++) {
int temp = arr[i][j];
arr[i][j] = arr[j][i];
arr[j][i] = temp;
}
}
}

//Full code link: https://onecompiler.com/c/42ddjq6qv