Run a code multiple times and save variables

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Stuart 2014-7-11

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https://ww2.mathworks.cn/matlabcentral/answers/141498-run-a-code-multiple-times-and-save-variables

评论： dpb 2014-7-12

采纳的回答： dpb

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Hi,

I would like to run the following code every 20 seconds for 5 minutes in order to get the latest bitcoin price.

rawdata = urlread('https://www.bitstamp.net/api/ticker/');
j = strfind(rawdata, 'high');
k = strfind(rawdata, 'last');
m = strfind(rawdata, 'vwap');
o = strfind(rawdata, 'volume');
p = strfind(rawdata, 'low');
High=rawdata(j+8:j+13);
Last=rawdata(k+8:k+13)
vwap=rawdata(m+8:m+13);
volume=rawdata(o+10:o+22);
low=rawdata(p+7:p+12);

I would like the value of high/last/vwap etc for each of the time periods. I am having trouble using a vector as I don't know if urlread can be used in this format.

Any help would be much appreciated.

Thanks,

Stu

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采纳的回答

dpb 2014-7-11

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https://ww2.mathworks.cn/matlabcentral/answers/141498-run-a-code-multiple-times-and-save-variables#answer_144734

编辑：dpb 2014-7-12

在 MATLAB Online 中打开

M=5;            % number of minutes
P=20;           % period between readings
N=60/P*M;       % readings expected
% format string for the data line returned...
fmt=['{"high": "%f", "last": "%f",' repmat('%*s ',1,4) '"vwap": "%f", "volume": "%f", "low": "%f"']
data=zeros(N,5); % preallocate
for i=1:N
  rawdata=urlread('https://www.bitstamp.net/api/ticker/');
  data(i,:)=sscanf(rawdata,fmt).';
  pause(P)
end

Your values will be

High Last VWAP Vol Low

by column for each period.

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Stuart 2014-7-12

Thanks dpb.

Much appreciated.

dpb 2014-7-12

No problem...you'll undoubtedly want to add some error handling and all...the pause is klunky; not sure whether there's a way to schedule it as a callback or not--never investigated that in Matlab.

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