Add new row to String Array.
27 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Adam Brabec
le 12 Juil 2020
Commenté : Adam Brabec
le 19 Juil 2020
Hi,
I have a Xx1 string array and I currently have something on the lines of:
strarray.full = [strarray.full;NEWDATA];
The code will add a new line each loop, and will re create the string array each time.
This works fine for smaller files, but the txt files I am reading are around 200,000 lines, so this takes around 20 minutes to run.
I am trying to get something like this to work to avoid having to re create the matrix each loop and make it alot faster.
strarray.full(end+1,1) = NEWDATA
I keep getting the Error "Unable to perform assignment becuse the indices on the left side are not compatible with the size of the right side"
The first loop results in an empty NEWDATA. I also do not believe I am allowed to share the code itself.
Thanks.
0 commentaires
Réponse acceptée
the cyclist
le 12 Juil 2020
You can preallocate memory for the entire string array with
str = strings(200000,1);
and then fill row-by-row rather than appending. This will avoid the string array being copied to different memory locations as it fills, and should radically speed up the operation.
1 commentaire
Plus de réponses (1)
Adam Brabec
le 13 Juil 2020
6 commentaires
the cyclist
le 18 Juil 2020
Not frustrated, and I don't feel like I wasted my time. I'm just trying to help you get to a solution efficiently.
Just bear in mind that any work you leave for someone else, rather than doing that prep work yourself, has to be done by every person who tries to help you. So, it can be a hurdle that some people just won't bother with.
Voir également
Catégories
En savoir plus sur Data Type Conversion dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!