Deprecated: Return type of ResultWrapper::current() should either be compatible with Iterator::current(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /var/www/vhosts/rave.gatech.edu/httpdocs/help/includes/db/DatabaseUtility.php on line 174
Deprecated: Return type of ResultWrapper::next() should either be compatible with Iterator::next(): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /var/www/vhosts/rave.gatech.edu/httpdocs/help/includes/db/DatabaseUtility.php on line 192
Deprecated: Return type of ResultWrapper::key() should either be compatible with Iterator::key(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /var/www/vhosts/rave.gatech.edu/httpdocs/help/includes/db/DatabaseUtility.php on line 185
Deprecated: Return type of ResultWrapper::valid() should either be compatible with Iterator::valid(): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /var/www/vhosts/rave.gatech.edu/httpdocs/help/includes/db/DatabaseUtility.php on line 202
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Deprecated: explode(): Passing null to parameter #2 ($string) of type string is deprecated in /var/www/vhosts/rave.gatech.edu/httpdocs/help/languages/Language.php on line 2104
Deprecated: explode(): Passing null to parameter #2 ($string) of type string is deprecated in /var/www/vhosts/rave.gatech.edu/httpdocs/help/languages/Language.php on line 2104
Deprecated: explode(): Passing null to parameter #2 ($string) of type string is deprecated in /var/www/vhosts/rave.gatech.edu/httpdocs/help/languages/Language.php on line 2104
Deprecated: explode(): Passing null to parameter #2 ($string) of type string is deprecated in /var/www/vhosts/rave.gatech.edu/httpdocs/help/languages/Language.php on line 2104
Deprecated: explode(): Passing null to parameter #2 ($string) of type string is deprecated in /var/www/vhosts/rave.gatech.edu/httpdocs/help/languages/Language.php on line 2104
Deprecated: explode(): Passing null to parameter #2 ($string) of type string is deprecated in /var/www/vhosts/rave.gatech.edu/httpdocs/help/languages/Language.php on line 2104
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| | + | =Introduction= |
| | + | One of the great things about Rave is that it can work not only with static [[data sets]], but with functions of variables that appear in [[data sets]]. For example, if you load a [[data set]] that contains a variable called "Weight (lbs)", you can easily create a new variable called "Weight (kg)" whose values are equal to Weight (lbs) / 2.2046. If later the values for the variable Weight (lbs) change, the values for Weight (kg) will automatically update to reflect that change, because the two are functionally related. |
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| − | ==Introduction== | + | The above example is an extremely simple function. In general there is no limit to how complicated your function can be, although if the function takes a long time to run it may be impractical for some applications. Functions can have multiple variables as inputs, and may have other [[functional variables]] as inputs as well (for example, y = f(x), z = g(y)). |
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| | + | An important limitation, however, is that the relations between your variables must form a "directed acyclic graph". Put simply, this means that each [[functional variable]] must be able to be represented as a function of only [[independent variables]] in the [[data set]] (although as described above, your actual implementation may involve other [[functional variables]]). Functions that form a "circular logic" loop are not allowed (for example y=f(z), z=g(y) ). |
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Fatal error: Uncaught TypeError: MWExceptionHandler::handleException(): Argument #1 ($e) must be of type Exception, Error given in /var/www/vhosts/rave.gatech.edu/httpdocs/help/includes/exception/MWExceptionHandler.php:153
Stack trace:
#0 [internal function]: MWExceptionHandler::handleException()
#1 {main}
thrown in /var/www/vhosts/rave.gatech.edu/httpdocs/help/includes/exception/MWExceptionHandler.php on line 153