Historical Stock Data downloader

Used to retrieve historical stock data for a user-specified date range

Description

This program uses the Yahoo! Finance website to download and sort historical stock data for a user-specified time period. The user can either supply the program with individual ticker symbols or with a text file containing a list of ticker symbols. The program returns a structure array that holds information on the date, opening price, closing price, high, low, volume, and adjusted closing price. The user must specify the date range for the desired information, and has the option of specifying a sample frequency of daily, weekly, or monthly. Refer to the help section in the m-file for data formats and options.

• MATLAB release: MATLAB 7 (R14)
• Other requirements: The computer must be connected to the Internet in order to download stock data. If an error occurs regarding downloading information, refer to the Matlab command 'urlread' in order to determine how to correct the issue

[Olivier B.]

got an error at urlread level with the provided Goog example ... any hint ?

??? Undefined function or method 'eq' for input arguments of type 'cell'.

Error in ==> urlreadwrite at 14
protocol = urlChar(1:min(find(urlChar==':'))-1);

Error in ==> urlread at 68
[urlConnection,errorid,errormsg] = urlreadwrite(mfilename,urlChar);

Error in ==> hist_stock_data at 95
    [temp, status] = urlread(strcat('http://ichart.finance.yahoo.com/table.csv?s='...

[Josiah Renfree]

It's not giving me that error on the Matlab version I'm running, so it's hard for me to pinpoint what the problem is. But, I believe that it may be that it's inputting the ticker symbol into the urlread command as a cell array.

In the urlread command, you'll find the command 'tickers(i)'. Try changing that to 'tickers{i}' instead, so that it's not returning it as a cell array but as a string.

Let me know if that solves your problem, so that I can make the necessary corrections for future versions of the program

[John D'Errico]

Buggy code. BEWARE!

I'm running R2007a, and I too get errors for all test cases I've tried, including those given as examples by the author. I also tried changing the urlread call as suggested. So then I looked at the errors returned. Things are done like this:

77 if strcmp(varargin{1}(end-3:end),'.txt') % If text file supplied

If the user supplies stock ticker symbols for stocks that are shorter then 4 characters, then what do you think will happen? My guess is its an error.

This code is well documented. The help is good. But the code is sloppy, in the sense that it is not carefully written. There are no error checks. Are the dates provided valid dates? Are they even the correct length as dates? Are the two dates increasing in order? Are they even strings? It merely indexes into them as vectors.

More importantly, the other arguments are indexed as strings also. The code looks at the last 4 characters of a string to see if it is '.txt'. But if the string is a ticker symbol that is only 3 characters long, oops!

I really wanted to give this a lower rating. "needs improvement" seemed about right at first given the outright bugs. On the other hand, the code is well documented, it has an H1 line, it has lots of comments internally, and the author seems willing to repair the problems.

My advice to the author is to please test your code better. Also put in error checks, to make sure that you get the arguments that you expect. If not, then have it return a friendly error message that tells the user what they did wrong.

I'll happily return to this code in a few days to look for improvements.

[Josiah Renfree]

I noticed that error a couple days ago, and uploaded a newer version that corrected this error, but apparently Mathworks hasn't posted it yet. So yes you have a valid point regarding the tickers with fewer than 4 characters, but the new version already corrects for this. Hopefully Mathworks will post it tomorrow.

As for the date inputs, the m-file documents on the format it needs to be. I know I could have put in better error-checking and what not, but if you follow the directions of the m-file then it should be straightforward. It states the first date is the beginning time, and the second is the ending time. Also, they are input as strings, with the format ddmmyyyy. I believe it should all be there in the help.

Thanks for the comments and let me know if you find anything buggy with the new version.

[John D'Errico]

I tried the new version. It gets further, but still dies.

stocks = hist_stock_data('01012000','27012008','TMA')

??? Undefined function or method 'eq' for input arguments of type 'cell'.

Error in ==> iofun/private/urlreadwrite at 14
protocol = urlChar(1:min(find(urlChar==':'))-1);

14 protocol = urlChar(1:min(find(urlChar==':'))-1);

[Josiah Renfree]

I've uploaded a new m-file that hopefully corrects for this, so it should be up in the next couple of days.

The only thing I've changed though is that in the urlread command, 'tickers(i)' is now 'tickers{i}'. I'm guessing that the problem was that varargins is a cell array, and the program was retrieving the data as a cell, and not converting it to a string. So if you don't want to wait around for the new file to upload, then just make that small little change.

If that does alleviate the problem, could you let me know? It's hard for me to tell exactly what's causing this error, as this program is working perfectly for me.

Sorry that some of you are experiencing some troubles with this. I'm hoping that other people are having more success with this.

[Happy User]

That fixed it, thanks

[John D'Errico]

It seems to work now. My thanks to the author for getting it to work. I can't complain at all about the help - its really quite readable. This could be a useful utility.

[Olivier B.]

Works well for me too !

[Tsai wei-che]

useful code

[Chris Troutner]

Hey! Thank you so much for making such an awesome script! This was exactly what I was looking for and you saved me so much time. It worked perfectly on the first try.

[Austin Kalb]

Worked great out of the box!

[Lyle Ask]

Great! With a little modification of the date format, it works well with the Financial Time Series Toolbox.

[Brahim HAMADICHAREF]

Works well. Thank you.

[bob n]

Hi! Where can i get information on the yahoo api from where you are pulling the stocks info?? i've tried to find info on yahoo's site but i cant. any suggestions?

[Kevin T]

Great file. Well written and documented.

Bonus: works on R13 without single modification.

[jim cha]

 

[Cassio Carvalho]

It works very well!

[Gee Zee]

thanks for the code

[Laura Chico]

delivers as promised. thank you for submitting.

[raphael rubin]

I have a problem because of the prompt which opens up when downloading the file.
How do I get over that problem?

[Francisco Azeredo]

Thank you for the code, it works like a charm.

One request: Can the code be modified to download the dividend series as well?

[Al McJeff]

Yes very good.

[David Succaria]

Hi Gents,

While I agree with you that there are some free charting as well as some historical data which can be downloaded sparingly, I would suggest that to do real trend analysis, modeling and systems development for algorithmic trading strategies, along with associative research and back testing. You need a complete local database of historical data to use with your charting and analysis package of choice. To see the dramatic difference involved between looking up symbol data online and havinga complete database try the free trial offered by these guys...
http://www.forextickdata.com

They have end of day data and intraday high frequency historical data, across multiple asset classes. Best of all they include all delisted issues for a survivorship free database.

Happy research.

David

[sean brown]

I find this source http://blog.digvan.com/?p=6
it works great. try it.

[Janice Hawie]