Create variable from string

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Teresa
Teresa 2015-6-18
编辑： Stephen23 2019-6-19
I would like to alter a string in order to access a certain cell of a Matrix. Can I do that by creating a string first? For example
s='{2,1}{1,1}' and then somehow get A{2,1}{1,1}
Actually I would like to create something like a reference. Like
x=A{2,1} x=x{1,1} x=5
and then at the same time change A so I get the following value when calling
>>A{2,1}{1,1}
A{2,1}{1,1} =
5
Usually I would think of using a pointer but that does not seem to be possible in Matlab, or am I mistaken?
  1 个评论
Stephen23
Stephen23 2015-6-18
编辑：Stephen23 2015-6-18
Avoid doing this.
MATLAB does not support pointers, and creating some hack-code to improvise them will not be robust.
In particular using dynamic strings like this to define indexing (or variables names) is liable to difficult-to-debug errors. Learn to program using more robust techniques, and your own life will become much easier...

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回答（2 个）

Stephen23
Stephen23 2015-6-18
编辑：Stephen23 2019-6-19
Walter Roberson
Walter Roberson 2015-6-18
eval(['A', s])
and for assignment
eval(['A', s, ' = ', Value_As_string])
Not recommended at all.
  1 个评论
Stephen23
Stephen23 2015-6-18
编辑：Stephen23 2019-6-19
@Teresa: note that those words "Not recommended at all" that Walter Roberson wrote are actually very significant.

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