how is it possible to remove all the cells??

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samicorp
samicorp 2017-5-1
评论： Image Analyst 2017-5-2
is there a way to clear all the cell arrays at the beginning of the code like the way we do it for variables with clear all? if it is possible i do not want to clear each cell one by one like a{:} = {[]}; is there a way to remove all at once ? regards
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Rik
Rik 2017-5-1
First off, never use clear all, use clear variables instead.
Now to your question. Is there a reason you can't just overwrite your variable with something like C=cell(size(C));?
samicorp
samicorp 2017-5-2
@Rik Wisselink that is how you preallocate the cell but my question was how can i remove them all. as @hmi amid mentioned correctly clear all or clear variable would do the job which i did not pay attention to.

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Image Analyst
Image Analyst 2017-5-1
Use the command
varInfo = whos
by examining the varinfo structure, you can determine which variables are cell arrays. For example, when I called it when I had 11 variables in existence:
varInfo =
11×1 struct array with fields:
name
size
bytes
class
global
sparse
complex
nesting
persistent
Loop over all elements in the structure array and if you find a cell array, initialize it.
for k = 1 : length(varInfo)
if strcmpi(varInfo(k).class, 'cell')
% It's a cell array - initialize it
end
end
Frankly, it might be less complicated just to assign the known names of cell arrays to something. I mean, you know the names in your program, don't you?
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samicorp
samicorp 2017-5-2
i have already done that. the best way is to assign them one by one. although your way of assigning is also interesting. another question is that since i am working with quite large number of cells what is the fastest way of looping over all these cells? any example would be highly appreciated.
Image Analyst
Image Analyst 2017-5-2
I'm not sure what you're asking. I showed you how to find all the variables in your workspace that are cells or cell arrays (arrays of cells). And I show you how to loop over all of those. Or are you asking how to loop and visit every cell that is one element of a cell array?
Not sure you know what a cell is completely. See the FAQ for a discussion that should give you a good intuitive feel for what they are and how to use them. http://matlab.wikia.com/wiki/FAQ#What_is_a_cell_array.3F

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Jan
Jan 2017-5-2
Do not use clear all, because it does not only clear variables, but removed all loaded functions from the memory also. reloading them from the slow hard disk wastes a lot of time.
Using a general method to clear variables is not clean also. Better create functions for your codes, such that the workspace is kept clean.

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