清空筛选条件
清空筛选条件

memmapfile & char inputs

2 次查看（过去 30 天）
Graziano
Graziano 2011-7-6
Hi all, as I have to work with a massive ammunt of data, I have decided to give a try to memmapfile. As moust of you already know this allow me to map matlab to the the file without the need to import into matlab workspace.
The issue thought is the following: the txt file i am mapping contains both strings (i know which columns contain strings) and NA. I know I can specify multiple data format but it seems there's not the possibility to specify a char class.
Can I have some hint or a workaround to solve my problem?
Thanks!
Graziano

请先登录，再回答此问题。

回答（1 个）

Jan
Jan 2011-7-6
MEMMAPFILE cannot handle files which contain blocks of different size, e.g. text lines with varying length. So either use MEMMAPFILE to treat the complete file as a single stream of bytes, or decide to use the standard methods for serialized file reading.
Look in the examples of "doc memmapfile".
  2 个评论
Graziano
Graziano 2011-7-7
Thank you very much for your answer. I do appreciate it a lot. By serialized reading do you mean functions like fread? ...
Jan
Jan 2011-7-7
Yes. FREAD, FGETL, FGETS might by appropriate.

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Logical 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by