When you don't know what the name of a function in MATLAB might be, use the lookfor function.
lookfor weibull
networkTrafficVideoConference.WeibullScale - Scale parameter for Weibull distribution
networkTrafficVideoConference.WeibullShape - Shape parameter for Weibull distribution
surfaceReflectivityCustom.SpeckleScale - Scale parameter for Weibull and Rayleigh speckle distribution
surfaceReflectivityCustom.SpeckleShape - Shape value for Weibull distribution
surfaceReflectivityLand.SpeckleScale - Scale parameter for Weibull and Rayleigh speckle distribution
surfaceReflectivityLand.SpeckleShape - Shape value for Weibull distribution
surfaceReflectivitySea.SpeckleScale - Scale parameter for Weibull and Rayleigh speckle distribution
surfaceReflectivitySea.SpeckleShape - Shape value for Weibull distribution
classreg.learning.regr.CompactRegressionTree.gather - Gather properties of Statistics and Machine Learning Toolbox object from GPU
prob.NormalDistribution.cdf - Cumulative distribution function
prob.NormalDistribution.icdf - Inverse cumulative distribution function
prob.NormalDistribution.iqr - Interquartile range of probability distribution
prob.NormalDistribution.mean - Mean of probability distribution
prob.NormalDistribution.median - Median of probability distribution
prob.NormalDistribution.negloglik - Negative loglikelihood of probability distribution
prob.NormalDistribution.paramci - Confidence intervals for probability distribution parameters
prob.NormalDistribution.pdf - Probability density function
prob.NormalDistribution.plot - Plot probability distribution object
prob.NormalDistribution.proflik - Profile likelihood function for probability distribution
prob.NormalDistribution.random - Random numbers
prob.NormalDistribution.std - Standard deviation of probability distribution
prob.NormalDistribution.truncate - Truncate probability distribution object
prob.NormalDistribution.var - Variance of probability distribution
prob.WeibullDistribution - Weibull probability distribution object
prob.WeibullDistribution.A - Scale parameter
prob.WeibullDistribution.B - Shape parameter
prob.WeibullDistribution.IsTruncated - Logical flag for truncated distribution
prob.WeibullDistribution.NumParameters - Number of parameters
prob.WeibullDistribution.ParameterCovariance - Covariance matrix of the parameter estimates
prob.WeibullDistribution.ParameterIsFixed - Logical flag for fixed parameters
prob.WeibullDistribution.ParameterValues - Distribution parameter values
prob.WeibullDistribution.Truncation - Truncation interval
prob.WeibullDistribution.DistributionName - Probability distribution name
prob.WeibullDistribution.InputData - Data used for distribution fitting
prob.WeibullDistribution.ParameterDescription - Distribution parameter descriptions
prob.WeibullDistribution.ParameterNames - Distribution parameter names
wblcdf - Weibull cumulative distribution function
wblfit - Weibull parameter estimates
wblinv - Weibull inverse cumulative distribution function
wbllike - Weibull negative log-likelihood
wblpdf - Weibull probability density function
wblplot - Weibull probability plot
wblrnd - Weibull random numbers
wblstat - Weibull mean and variance
networkTrafficVideoConference.WeibullScale - Scale parameter for Weibull distribution
networkTrafficVideoConference.WeibullShape - Shape parameter for Weibull distribution
If you scan down the list of functions found, you will see wblfit. I'd bet that might help. Again, learn about the lookfor utility.
