str2num results
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Here is a test, please try it. I can't explain the reason. Thanks.
>> a='sss'
a =
'sss'
>> b=str2num(a)
b =
[]
>> isnumeric(b)
ans =
logical
1
>> a='ss'
a =
'ss'
>> b=str2num(a)
b =
Empty state-space model.
>> isnumeric(b)
ans =
logical
0
>> a='ssa'
a =
'ssa'
>> b=str2num(a)
b =
[]
>> isnumeric(b)
ans =
logical
1
>>
1 commentaire
Geoff Hayes
le 5 Fév 2020
John - I saw this link Create state-space model, convert to state-space model which may be relevant given the 'ss' string and the 'Empty state-space model' message. Perhaps, under the hood, MATLAB is taking the 'ss' string and somehow creating a state space model (since ss is the function used to create a state space model).
Réponses (3)
Steven Lord
le 5 Fév 2020
From the documentation page for str2num: "In addition, str2num uses the eval function, which can cause unintended side effects when the input includes a function name. To avoid these issues, use str2double."
Neither sss nor ssa are functions in any MathWorks product.
ss is a function in Control System Toolbox.
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