How much data does an array take?

6 次查看（过去 30 天）
Alec Bledsoe
Alec Bledsoe 2023-11-4
评论： Walter Roberson 2023-11-4
My question is pretty much entirely in the title. I am curious about how matlab stores data and specifically how much data an nxn array takes to store. Is each element of the array an individual 8 byte double so the size is 8*n^2 bytes?

请先登录，再回答此问题。

采纳的回答

James Tursa
James Tursa 2023-11-4
编辑：James Tursa 2023-11-4
The data is held in contiguous memory, so yes for a full real double an NxN matrix would take 8*N^2 bytes for the data. Then there is a variable header that contains info such as class, dimensions, data pointers, etc. That takes an additional 132(?) bytes or so per variable. The actual header amount can vary from release to release, and I haven't checked lately what it is currently.
  4 个评论
显示 2更早的评论
Alec Bledsoe
Alec Bledsoe 2023-11-4
Got it thank you. How do I check the header size?
Walter Roberson
Walter Roberson 2023-11-4
https://www.mathworks.com/matlabcentral/answers/2010767-struct-function-in-matlab
My answer there analyzes struct.
96 bytes to describe a variable. 8 bytes pointer to the data. Another 64 bytes to hold the variable name.

请先登录，再进行评论。

更多回答（0 个）

类别

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

标签

产品


版本

R2023b

Community Treasure Hunt

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

Start Hunting!

Translated by