gamrnd — Generate gamma-distributed random samples.
gamrnd(a,b) generates gamma random samples with shape parameter a and scale parameter b. Size-vector and dimension-list forms are supported.
Syntax
r = gamrnd(a, b)
r = gamrnd(a, b, sz)
r = gamrnd(a, b, sz1, sz2, ...)Inputs
| Name | Type | Required | Default | Description |
|---|---|---|---|---|
a | Any | Yes | — | First distribution parameter. |
b | Any | Yes | — | Second distribution parameter. |
sz | Any | Variadic | — | Output size arguments. |
Returns
| Name | Type | Description |
|---|---|---|
r | NumericArray | Random sample array. |
Errors
| Identifier | When | Message |
|---|---|---|
RunMat:gamrnd:InvalidArgument | Input parameters or size arguments are missing, malformed, or incompatible. | distribution random: invalid argument |
RunMat:gamrnd:Internal | Internal tensor conversion, allocation, or RNG state access fails. | distribution random: internal error |
How gamrnd works
aandbsupport scalar expansion and matching array shapes.- Without explicit size arguments, the output shape is the scalar-expanded parameter shape.
- With explicit size arguments, nonscalar parameters must match the requested shape.
amust be nonnegative andbmust be positive.- MATLAB-compatible mode accepts documented single and double parameters and size controls. Native typed-integer parameters or dimensions are separately declared RunMat extensions; admitted numerical parameters must be exactly representable at the binary64 sampling boundary.
- Automatic internal residency may gather transparently. Documented explicit floating gpuArray input preserves its provider ownership and output residency.
Example
Generate a 2-by-3 gamma sample array
r = gamrnd(3,7,2,3)Using gamrnd with coding agents
Open a RunMat example with live inputs, then ask the agent to explain how gamrnd changes the result.
Run a small gamrnd example, explain the result, then change one input and compare the output.
FAQ
Which RNG does gamrnd use?⌄
It uses RunMat's shared deterministic RNG state, so rng('default') resets subsequent gamrnd output.
Related Stats functions
Random
binornd · bootstrp · datasample · dividerand · exprnd · lhsdesign · mvnrnd · normrnd · random · randsample · rng · trnd · unidrnd · unifrnd · wblrnd
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
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 · wblinv
Hist
Open-source implementation
Unlike proprietary runtimes, every RunMat function is open-source. Read exactly how gamrnd is executed, line by line, in Rust.
- View the source for gamrnd 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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