# calcule,report_mig_mult-method

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##### #' Transforms migration per period to daily migrations, and performs the conversion from weights to number is data are stored as weights (glass eel). This calculation is performed in a loop for all dc.

The calculation must be launched once data are filled by the connect method. Currently the negative argument has no effect.

##### Usage
# S4 method for report_mig_mult
calcule(object, negative = FALSE,
silent = FALSE)
##### Arguments
object

An object of class report_mig_mult-class

negative

a boolean indicating if a separate sum must be done for positive and negative values, if true, positive and negative counts return different rows

silent

Default FALSE, should messages be stopped

##### Value

report_mig_mult with a list in slot calcdata. For each dc one will find a list with the following elements

method

In the case of instantaneous periods (video counting) the sum of daily values is done by the fun_report_mig_mult method and the value indicated in method is "sum". If any migration monitoring period is longer than a day, then the migration is split using the fun_report_mig_mult_overlaps function and the value indicated in the method is "overlaps" as the latter method uses the overlap package to split migration period.

data

the calculated data. If weight are present, the columns display weight or numbers, the total number is "Effectif_total" and corresponds to the addition of numbers and numbers converted from weight, the total weight is "Poids_total"+"poids_depuis_effectifs" and corresponds to weighed glass eel plus glass eel number converted in weights. CALCULE corresponds to calulated number, MESURE to measured numbers, EXPERT to punctual expertise of migration (for instance measured in other path, or known migration of fishes passing the dam but not actually counted, PONCTUEL to fishes counted by visual identification but not by the counting apparatus (in case of technical problem for instance)

contient_poids

A boolean which indicates, in the case of glass eel, that the function fun_weight_conversion has been run to convert the weights to numbers using the weight to number coefficients in the database (see linkreport_ge_weight).

negative

A parameter indicating if negative migration (downstream in the case of upstream migration devices) have been converted to positive numbers, not developed yet

##### Note

The class does not handle escapement rates, though structurally those are present in the database. If you want to use those you will have to do the calculation manually from the data in report_mig_mult@data. Note also that running the calcule method requires to have a database called test in postgres, and empty database in which all sqldf group by queries are run. The user and password for the test database are taken from the calcmig.csv configuration file.

##### Aliases
• calcule,report_mig_mult-method
• calcule.report_mig_mult
Documentation reproduced from package stacomiR, version 0.5.3.1, License: GPL (>= 2)

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