Adding repetitive number to web address.

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Muhammad Qaisar Fahim 2022-3-17

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1674369-adding-repetitive-number-to-web-address

评论： Walter Roberson 2022-3-18

n=100;
for k=1:1:n
    B(k)=Locs(1,k)
    C(k)=Locs(2,k)
    r2(i)=webread('https:/........=B(i), C(i)');
end

In the above code I want to extract each value in Locs matrix and for each pair of value i.e., B and C I want to automatically calculate r2(i) which is basically calling a webside. When I code it like this to automatically use the values of B(i) and C(i) it gives me below mentioned error. But when I input values manually and calculate it works fine. I think there is an issue with the way I am giving B(i) and C(i) in the website. Please correct me.

Error using matlab.internal.webservices.HTTPConnector/copyContentToByteArray (line 373)

The server returned the status 400 with message "Bad Request" in response to the request to

URL https:.....

Error in readContentFromWebService (line 46)

byteArray = copyContentToByteArray(connection);

Error in webread (line 125)

[varargout{1:nargout}] = readContentFromWebService(connection, options);

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采纳的回答

Walter Roberson 2022-3-18

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1674369-adding-repetitive-number-to-web-address#answer_920649

在 MATLAB Online 中打开

r2(k) = webread( "https:/........=" + B(k) + ", " + C(k));

assuming that the syntax is something followed by a literal equal sign, followed by the content of B(k), followed by a comma and then space, then the content of C(k)

Caution: it is uncommon for spaces to appear in URLs. When they do appear, they often have to be encoded as %20

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Muhammad Qaisar Fahim 2022-3-18

Thanks yes this helps. Very nice explanation

Walter Roberson 2022-3-18

在 MATLAB Online 中打开

baseurl = "https://abc.xyz.org/a1/mem21m?sites="
baseurl = "https://abc.xyz.org/a1/mem21m?sites="
B = randi([-90 90], 1, 5)
B = 1×5
    85    84   -10   -89    13
C = randi([-90 90], 1, 5)
C = 1×5
   -22    65    -9   -84    40
for k = 1 : length(B)
    thisurl = baseurl + B(k) + ", " + C(k)
    result{k} = webread(thisurl)
end
thisurl = "https://abc.xyz.org/a1/mem21m?sites=85, -22"
Error using webread
Could not access server. https://abc.xyz.org/a1/mem21m?sites=85,+-22.

And that is why I did not use webread(): I knew it would generate an error on the first attempt, so you would have seen only one example URL (because the error would have prevented the other example URL from being constructed.) As Steven indicates, the problem you were having trouble with was the text manipulation.

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