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The randomVariablePositioner command has been removed and is now replaced by the parameterization framework. All parameters (random variables as well as finite element model and response parameters) are now created using the parameter command. See the examples in the SRC/reliability/EXAMPLES folder ...

The syntax for the limit state functions has changed since his dissertation:

performanceFunction 1 "{x_1} + {x_2} + {x_4} + {x_5} - {x_6} * 5.0"

is now written as:

performanceFunction 1 "\$xrv(1) + \$xrv(2) + \$xrv(4) + \$xrv(5) - \$xrv(6)*5.0"

You need to create the random variable before you can position it. This would entail the "randomVariable ..." syntax that specifies the type of the variable and it's parameters. Also, you are trying to associate the random variable with a parameter, so you need to have the parameter pre-de...

It is not running in either version of OpenSees, but you will need to provide more information. The gradient is usually zero if you are not using any random variables in your analysis, your limit state function does not contain any explicit or implicit quantities, your analysis is not returning the ...