when i run the example algo from the help file, i get a warning that the @batch_transform method is deprecated and to use the history function instead. has anyone replaced that line of code? if so, can you please share it?
sincerely,
quantopian rookie
Hi David,
Welcome to Quantopian! Batch transforms are indeed deprecated, you'll want to use the history() function to access historical data. I'm not sure which specific line you're referring to in the help documentation, do you think you could specify? In the meantime, this tutorial video might help you to understand how history() works.
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thanks. i am trying to replace this line:
with this line:
history(10, '1d', 'price')
when i try it at the same location in the code, it tells me that i need to have the history function in the handle_data portion of the code.
when i try it at any position in handle_data, it tells me that there was a runtime error on this line:
rval = minmax(data)
thanks for your time
Ah, I see the confusion. We are actually in the process of removing that example from the help docs because history() has totally replaced @batch_transform(). The history() function always needs to be called within another function such as handle_data or a scheduled function. I would strongly recommend going through the Getting Started Tutorial Series. These should help you get a grasp of the API!
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.
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.
