Dear UQLab Team,

I encountered a problem when doing Sobol sensitivity analysis. If the distribution of a design variable is determined, such as two parameter Weibull distribution, the shape parameter is 7.101 and the scale parameter is 2636.214. My question is：*InputOpts.Marginals(1).Parameters=[A,B]*, are A and B shape parameters and scale parameters, respectively? I’m a little vague about this. In addition, if it is a three parameter Weibull distribution, how to set the parameters?

The following is the process of a simple program, but it prompts an error: *nonFiniteContourError*.

Specify the marginals as follows:

InputOpts.Marginals(1).Name = ‘R1’;

InputOpts.Marginals(1).Type = ‘Weibull’;

InputOpts.Marginals(1).Parameters = [7.101 2636.214];

InputOpts.Marginals(2).Name = ‘R2’;

InputOpts.Marginals(2).Type = ‘Weibull’;

InputOpts.Marginals(2).Parameters = [8.667 5412.962];

InputOpts.Marginals(3).Name = ‘R3’;

InputOpts.Marginals(3).Type = ‘Weibull’;

InputOpts.Marginals(3).Parameters = [8.382 4334.643];

InputOpts.Marginals(4).Name = ‘R4’;

InputOpts.Marginals(4).Type = ‘Weibull’;

InputOpts.Marginals(4).Parameters = [4.664 2349.128];

The response function is Y=R1* R2* R3* R4

Thanks in advance