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Saving and Build Algorithm: Backtesting after code changes
Carol Willing
posted Jan 30, 2015

@Thomas Not sure if I am just not getting the UI or if this is an issue. I cloned the "9 ETF example algorithm". I edited the clone to change some of the ETF symbols. I clicked save and then build algorithm. It ran. Then did a full backtest. It ran fine.

At this point I edited the symbols of the ETFs to use a different ETF. Save may have been greyed out. I clicked Save anyway and then clicked Build Algorithm. It ran yet this time the blue algorithm line tracked zero.

It's happened on a few models that I have run. I'm wondering if there are UI process steps with Save and Build Algorithm as well as Editing or Renaming an existing algorithm that I am not understanding.

Thanks!

5 responses
Carol Willing
Jan 30, 2015

It is possible that this may be an issue with Chrome. Same issue has not been seen on Firefox.

Calvin Hobbes
Jan 30, 2015

I have had the same issue, I've found that letting it sit for a while and coming back to it tends to work fine, but still bothersome.

Alisa Deychman
Jan 30, 2015

Carol, Calvin, were you working in multiple tabs in the browser? If so, this might throw the saving issue, take a look at Dan's response here: https://www.quantopian.com/posts/algorithm-not-saved

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The material on this website is provided for informational purposes only and does not constitute an offer to sell, a solicitation to buy, or a recommendation or endorsement for any security or strategy, nor does it constitute an offer to provide investment advisory services by Quantopian. In addition, the material offers no opinion with respect to the suitability of any security or specific investment. No information contained herein should be regarded as a suggestion to engage in or refrain from any investment-related course of action as none of Quantopian nor any of its affiliates is undertaking to provide investment advice, act as an adviser to any plan or entity subject to the Employee Retirement Income Security Act of 1974, as amended, individual retirement account or individual retirement annuity, or give advice in a fiduciary capacity with respect to the materials presented herein. If you are an individual retirement or other investor, contact your financial advisor or other fiduciary unrelated to Quantopian about whether any given investment idea, strategy, product or service described herein may be appropriate for your circumstances. All investments involve risk, including loss of principal. Quantopian makes no guarantees as to the accuracy or completeness of the views expressed in the website. The views are subject to change, and may have become unreliable for various reasons, including changes in market conditions or economic circumstances.

Carol Willing
Jan 30, 2015

Alisa, I read Dan's response. While I do have multiple tabs open in the browser in Chrome, I followed essentially the same process in Firefox. I was also having responsiveness issue with some of the frames in Chrome (i.e. resizing the code window on Mac OSX 10.9.2). I am a Python/Scientific Python dev. I will try to reproduce the issue over the weekend. If I am able to successfully reproduce, is there an issue tracker where you would like me to file the issue?

It seems just fine on Firefox :)

Carol Willing
Jan 31, 2015

Alisa, I went back and tried to reproduce on Chrome and could not. I suspect the multiple tabs as you suggested may have been the issue. If I run across the issue again, I will let you know. Thanks!

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The material on this website is provided for informational purposes only and does not constitute an offer to sell, a solicitation to buy, or a recommendation or endorsement for any security or strategy, nor does it constitute an offer to provide investment advisory services by Quantopian.

In addition, the material offers no opinion with respect to the suitability of any security or specific investment. No information contained herein should be regarded as a suggestion to engage in or refrain from any investment-related course of action as none of Quantopian nor any of its affiliates is undertaking to provide investment advice, act as an adviser to any plan or entity subject to the Employee Retirement Income Security Act of 1974, as amended, individual retirement account or individual retirement annuity, or give advice in a fiduciary capacity with respect to the materials presented herein. If you are an individual retirement or other investor, contact your financial advisor or other fiduciary unrelated to Quantopian about whether any given investment idea, strategy, product or service described herein may be appropriate for your circumstances. All investments involve risk, including loss of principal. Quantopian makes no guarantees as to the accuracy or completeness of the views expressed in the website. The views are subject to change, and may have become unreliable for various reasons, including changes in market conditions or economic circumstances.