Incorrect behavior of str2num?

13 May 2020
1 Answer
Answer Accepted
Updated 13 May 2020
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0 votes

Hi,
This seems not to work as intended:
>> str2num('"Y"')
ans =
"Y"
This should return an empty array.

5 Comments
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dpb
dpb on 13 May 2020
Can't reproduce that here w/ R2019b. Which release?
Tried clear str2num yet first?
Arjan Lampe
Arjan Lampe on 13 May 2020
R2018b
No, I didn't name a variable str2num
goerk
goerk on 13 May 2020
I can reproduce the behaviour with R2017b.
Image Analyst
Image Analyst on 13 May 2020
Edited: Image Analyst on 13 May 2020
In r2020a:
>> str2num('"Y"')
ans =
[]
as expected, since it's not a number. So the best answer is to upgrade. Can you do that? Are you on the maintenance plan?
Arjan Lampe
Arjan Lampe on 13 May 2020
Well, my company is, but I've just merged to R2018b a month ago or so. So upgrading is not going to happen soon... Anyway, I'll work my way around it then.

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 Accepted Answer

Fangjun Jiang
Fangjun Jiang on 13 May 2020

0 votes

Seems that way.
>> version
ans =
'9.5.0.1298439 (R2018b) Update 7'
>> str2num('"Y"')
ans =
"Y"
>> version
ans =
'9.7.0.1319299 (R2019b) Update 5'
>> str2num('"Y"')
ans =
[]

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