webread error with input ??

13 Giu 2018
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Aggiornato 18 Giu 2018
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Hi,
I am using webread for the first time in R2017b. Very unusual behavior :
>> webread('https://www.mathworks.com/matlabcentral')
Error using webread (line 119)
First input must be a string array or cell array of character vectors.
But urlread works fine
>> urlread('https://www.mathworks.com/matlabcentral')
ans =
'<!DOCTYPE HTML>
<html>
<head>
Any clue ? Tried restarting Matlab, no help.

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Rik
Rik il 13 Giu 2018
Odd. I can't reproduce this on R2017b (W10). Digging into the webread function I found out that line 119 is the following code
[url, options] = encodeInputs(url, queryParams, options);
This should not error, as you input is just a char array. Does this same error occur when you try to input it as a string or a cellstr?
Christopher Coello
Christopher Coello il 13 Giu 2018
Yes. I tried
webread({'https://www.mathworks.com/matlabcentral'})
Error using webread (line 119)
Expected URL to be one of these types:
char, string, matlab.net.URI
Instead its type was cell.
without success.I agree this is very odd.
Christopher Coello
Christopher Coello il 13 Giu 2018
Could it come from the default weboptions ?
options =
weboptions with properties:
CharacterEncoding: 'auto'
UserAgent: 'MATLAB 9.3.0.713579 (R2017b)'
Timeout: 5
Username: ''
Password: ''
KeyName: ''
KeyValue: ''
ContentType: 'auto'
ContentReader: []
MediaType: 'application/x-www-form-urlencoded'
RequestMethod: 'auto'
ArrayFormat: 'csv'
HeaderFields: []
CertificateFilename: 'C:\bin\MATLAB\R2017b\sys\certificates\ca\rootcerts.pem'
Nirav Sharda
Nirav Sharda il 15 Giu 2018
Can you provide the output of the following command?
which -all webread
Christopher Coello
Christopher Coello il 16 Giu 2018
Here
>> which -all webread
C:\bin\MATLAB\R2017b\toolbox\matlab\external\interfaces\webservices\restful\webread.m
Nirav Sharda
Nirav Sharda il 18 Giu 2018
Can you attach the webread.m file mentioned on the above path?
Christopher Coello
Christopher Coello il 18 Giu 2018
Here it is
Christopher Coello
Christopher Coello il 18 Giu 2018
By the way, trying everytime I start R2017b, but still get the same error.
>> webread(sprintf('%s','https://www.mathworks.com/matlabcentral'))
Error using webread (line 119)
First input must be a string array or cell array of character vectors.
Nirav Sharda
Nirav Sharda il 18 Giu 2018
Modificato: Nirav Sharda il 18 Giu 2018
Line 119 of the 'webread' function as mentioned in the error calls the 'encodeInputs' function which in-turn calls another internal function. Can you add break-points in the code and identify the line causing the issue?

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Nirav Sharda
Nirav Sharda
il 18 Giu 2018

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