How do I change string to double without changing number of zero under decimal point?

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Capulus_love
Capulus_love 2020-8-21
回答： Walter Roberson 2020-8-21
a = '24.5';aa = "24.5";
b = str2double(aa)
d = double(a)
d = double(aa)
c = cast(aa,'double')
c = cast(a,'double')
i know
class(a)
class(aa)
answer is
ans = 'char'
ans = 'string'
Each answer shows either
24.5000
or
[50 52 46 53]
Question is that how can I change class char to double without changing number of zero under decimal point?
24.5
Is there any function?

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采纳的回答

Walter Roberson
Walter Roberson 2020-8-21
You cannot. class double does not keep track of how many trailing decimal points are present. class double is not stored in decimal at all: it is stored in binary floating point using an international standard representation that cannot exactly represent 1/10 (for the same mathematical reasons that decimal cannot exactly represent 1/3)
When you are seeing 2.5000 you are seeing one of the several different ways that the mathematical number can be represented. If you were to command
format long g
and display the number again you would see another representation. format bank would give you another.

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