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# Bug 1552 - implement ft_math_xxx functions

Status | CLOSED FIXED |

Reported | 2012-06-24 15:58:00 +0200 |

Modified | 2019-08-10 11:56:14 +0200 |

Product: | FieldTrip |

Component: | core |

Version: | unspecified |

Hardware: | PC |

Operating System: | Mac OS |

Importance: | P3 normal |

Assigned to: | |

URL: | |

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Depends on: | |

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## Robert Oostenveld - 2012-06-24 15:58:33 +0200

Rather than doing (see http://fieldtrip.fcdonders.nl/example/preprocessing_eeg?&#computing_and_plotting_the_erp_s) difference = task1; % copy one of the structures difference.avg = task1.avg - task2.avg; % compute the difference ERP cfg = []; cfg.layout = 'mpi_customized_acticap64.mat'; cfg.interactive = 'yes'; ft_multiplotER(cfg, difference) it would be better for tracking the modifications to the data by difference = ft_math_subtract([], task1, task2) Other functions could be ft_math_add (or sum, N>1 inputs) ft_math_divide (two inputs) ft_math_multiply (N>1 inputs) ft_math_log10 (one input only) and perhaps also ft_math_mean (N>1 inputs) ft_math_std (N>1 inputs) Rather than ft_math_xxx we could also make a ft_math function where the operation is in the cfg. At least the cfg should be useable to specify the parameter on which to do the math operation. TODO: discuss in the FT meeting

## Robert Oostenveld - 2012-10-13 17:09:32 +0200

I have implemented an ft_math with cfg.operation and cfg.value (in case there is only one input data structure). Also implemented a test script. Committed revision 6750. See http://code.google.com/p/fieldtrip/source/detail?r=6750 for all details.