how matlab stores graphics objects?

2 次查看（过去 30 天）
Osama Alkurdi
Osama Alkurdi 2021-2-27
回答： Steven Lord 2021-2-27
when i create a figure i noticed that it have alot of propeties and each property hold values,
that means alot of bytes, but the figure size seems to be 8 bytes despite all the properties values which are having a greater size,
my question is if properties values are not stored on (RAM), then where the properties values are stored then, and how matlab calls them that fast if they are really not stored on RAM.
please don't give me links, and thanks in advance
  3 个评论
显示 1更早的评论
Osama Alkurdi
Osama Alkurdi 2021-2-27
编辑：Osama Alkurdi 2021-2-27
sorry about that, docs have a very elaboration and dont give the point quickly.
Osama Alkurdi
Osama Alkurdi 2021-2-27
编辑：Osama Alkurdi 2021-2-27
give me a link if you have one explains this please.

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Steven Lord
Steven Lord 2021-2-27
Ran in:
The Bytes column of the output of whos does not tell the "truth, whole truth, and nothing but the truth" for certain situations.
A = zeros(100);
B = A;
whos A B
Name Size Bytes Class Attributes A 100x100 80000 double B 100x100 80000 double
A and B do not necessarily point to a different block of 80,000 bytes due to the copy-on-write behavior of MATLAB.
f = figure;
whos f
Name Size Bytes Class Attributes f 1x1 8 matlab.ui.Figure
This does not list the full amount of memory required to store all the data and properties associated with a figure window.
Use that data as guidance, not law.
And no, there is no way to get the actual amount of memory associated with f (maybe walking the list of properties in a MEX-file, but again things like copy-on-write would complicate even that.)

更多回答（2 个）

Jan
Jan 2021-2-27
编辑：Jan 2021-2-27
This shows, that the displayed "Bytes" in the output of whos does not mean the actually used memory. Note that a variable has an overhead of about 100 Bytes also, so "24 Bytes" for x is not the actual memory consumption also, but only the size of the payload.
  1 个评论
Osama Alkurdi
Osama Alkurdi 2021-2-27
编辑：Osama Alkurdi 2021-2-27
thank you but let me ask my question in a simple and different way, how the container(figure) can be less size than the contents (figure properties), that makes no sense.

请先登录，再进行评论。

Bruno Luong
Bruno Luong 2021-2-27
编辑：Bruno Luong 2021-2-27
All graphic objects are class "handle". Handles is a identify to designate the object and it's obviously 8 bytes as showed by whos command (ihanle is probaby a pointer or or hashcode, we shoudn't care about the internal meaning).
All the properties and RAM storage are not showed with whos.
Matlab might share RAM for many the data, that happens with object class such as graphical underlined and hierarchical objects.
Details of grahical properties are subjected to change from version to version.

类别

在 Help Center 和 File Exchange 中查找有关 Graphics Object Programming 的更多信息

标签

产品


版本

R2020a

Community Treasure Hunt

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

Start Hunting!

Translated by