Run a code multiple times and save variables
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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
采纳的回答
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.
4 个评论
Stuart
2014-7-11
dpb
2014-7-12
Check on rawdata being valid and what does
sscanf(fmt,rawdata)'
return at the command line?
Here with a sample line downloaded I get
>> rawdata
rawdata =
{"high": "635.00", "last": "633.00", "timestamp": "1405114465", "bid": "633.00", "vwap": "625.52", "volume": "6238.10039398", "low": "613.46", "ask": "634.78"}
>> sscanf(rawdata,fmt).'
ans =
1.0e+03 *
0.6350 0.6330 0.6255 6.2381 0.6135
Ewww.... :( My bad, somehow what I posted here has the arguments to sscanf reversed--should be
data(i,:)=sscanf(rawdata,fmt).';
I edited Answer to make the correction.
Stuart
2014-7-12
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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