wblinv — Evaluate the inverse Weibull cumulative distribution function.
wblinv(p) evaluates the unit Weibull inverse CDF. wblinv(p,a,b) uses scale parameter a and shape parameter b.
Syntax
x = wblinv(p)
x = wblinv(p, a, b)Inputs
| Name | Type | Required | Default | Description |
|---|---|---|---|---|
p | Any | Yes | — | Probability value. |
a | Any | No | 1 | Scale parameter. |
b | Any | No | 1 | Shape parameter. |
Returns
| Name | Type | Description |
|---|---|---|
y | NumericArray | Distribution function value. |
Errors
| Identifier | When | Message |
|---|---|---|
RunMat:wblinv:InvalidArgument | Inputs are nonnumeric, sizes are incompatible, or too many arguments are supplied. | normal distribution: invalid argument |
RunMat:wblinv:Internal | Internal tensor conversion or allocation fails. | normal distribution: internal error |
How wblinv works
p,a, andbsupport scalar expansion and matching array shapes.- The documented input classes are single and double. Typed-integer probability, scale, and shape roles are independently gated RunMat extensions and must be exactly representable before binary64 Weibull evaluation.
- Output is single when any documented input is single and double otherwise.
pmust be in[0,1];aandbmust be positive. Invalid parameters produceNaNoutputs.p == 0returns zero andp == 1returnsInf.- Confidence-bound output forms that depend on fitted-parameter covariance are not implemented.
Example
Weibull median
x = wblinv(0.5,3,4)Expected output:
x = 2.7376Using wblinv with coding agents
Open a RunMat example with live inputs, then ask the agent to explain how wblinv changes the result.
Run a small wblinv example, explain the result, then change one input and compare the output.
FAQ
What is the formula?⌄
RunMat computes a * (-log(1-p))^(1/b) for valid probabilities and positive parameters.
Related Stats functions
Summary
binocdf · boxplot · cdf · cdfplot · chi2cdf · corr · corrcoef · corrcov · cov · cov2corr · dummyvar · ecdf · filloutliers · fitdist · geomean · grpstats · harmmean · icdf · isoutlier · kstest · kurtosis · lsline · mad · mode · nanmax · normalize · normcdf · norminv · normpdf · onehotdecode · onehotencode · pdf · prctile · quantile · refline · rmse · skewness · tabulate · tcdf · tiedrank · tinv · tpdf · ttest2
Ml
bayesopt · classify · confusionmat · crossvalind · cvpartition · fitclinear · fitctree · fitlm · kmeans · knnsearch · lasso · lassoglm · linkage · lscov · mnrfit · optimizableVariable · pdist · pdist2 · perfcurve · predict · regress · ridge · squareform · test · training · tsne
Random
binornd · bootstrp · datasample · dividerand · exprnd · gamrnd · lhsdesign · mvnrnd · normrnd · random · randsample · rng · trnd · unidrnd · unifrnd · wblrnd
Hist
Open-source implementation
Unlike proprietary runtimes, every RunMat function is open-source. Read exactly how wblinv is executed, line by line, in Rust.
- View the source for wblinv in Rust on GitHub
- Learn how the RunMat runtime works
- Found a bug? Open an issue with a minimal reproduction.
About RunMat
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