realmin — Return the smallest positive normalized floating-point value.
realmin returns the smallest positive normalized value for double or single; the default is double.
Syntax
value = limit()
value = limit(classname)Inputs
| Name | Type | Required | Default | Description |
|---|---|---|---|---|
classname | StringScalar | No | — | Numeric class name. |
Returns
| Name | Type | Description |
|---|---|---|
value | Any | Limit value. |
Errors
| Identifier | When | Message |
|---|---|---|
RunMat:numericLimits:InvalidClass | The requested class is not supported by the limit query. | numeric limit: unsupported class |
How realmin works
- Supports
doubleandsingleclass names.
Does RunMat run realmin on the GPU?
No GPU kernels are launched.
GPU memory and residency
The result is host-resident.
Example
Double precision real minimum
realminExpected output:
ans = double real minimumUsing realmin with coding agents
Open a RunMat example with live inputs, then ask the agent to explain how realmin changes the result.
Run a small realmin example, explain the result, then change one input and compare the output.
FAQ
Does this return denormals?⌄
No. It returns the normalized minimum, matching MATLAB's documented behavior.
Related Math functions
Elementwise
abs · angle · bsxfun · complex · conj · double · erf · erfcinv · exp · expm1 · factorial · flintmax · gamma · gammaln · heaviside · hypot · idivide · imag · intmax · intmin · ldivide · log · log10 · log1p · log2 · minus · nextpow2 · plus · pow2 · power · rdivide · real · realmax · realsqrt · rescale · sign · single · sqrt · swapbytes · times · uint32
Trigonometry
acos · acosh · asin · asinh · atan · atan2 · atanh · cos · cosd · cosh · cospi · deg2rad · pol2cart · rad2deg · sin · sind · sinh · sinpi · tan · tand · tanh
Reduction
all · any · bounds · cummax · cummin · cumprod · cumsum · cumtrapz · diff · gradient · max · maxk · mean · median · min · mink · movmax · movmean · movmedian · movmin · movprod · movstd · movsum · movvar · nnz · prod · rms · std · sum · trapz · var
Structure
bandwidth · isdiag · ishermitian · issymmetric · istril · istriu · symrcm
Signal
blackman · butter · buttord · cheb2ord · conv · conv2 · deconv · downsample · envelope · filter · filtfilt · fir1 · freqz · gauspuls · hamming · hann · hilbert · periodogram · pulstran · pwelch · rectpuls · resample · sawtooth · sinc · spectrogram · square · tripuls · unwrap · upsample · zplane
Optim
coneprog · fminbnd · fminunc · fsolve · fzero · integral · linprog · lsqcurvefit · lsqnonlin · optimset · quad · secondordercone
Ops
cross · ctranspose · dot · mldivide · mpower · mrdivide · mtimes · pagemtimes · pagetranspose · trace · transpose
Open-source implementation
Unlike proprietary runtimes, every RunMat function is open-source. Read exactly how realmin is executed, line by line, in Rust.
- View the source for realmin in Rust on GitHub
- Learn how the RunMat runtime works
- Found a bug? Open an issue with a minimal reproduction.
About RunMat
RunMat is an open-source runtime that executes MATLAB-syntax code blazing on any GPU. It is licensed under the Apache 2.0 license.
- RunMat automatically optimizes your math for GPU execution on Apple, Nvidia, and AMD hardware. No code changes needed. Simulations that took hours now take minutes.
- Start running code in seconds. RunMat runs in the browser, on the desktop, or from the CLI. No license server, no IT ticket.