digits — Get or set the default variable-precision digit count.
digits returns the current default precision for vpa. digits(d) sets the precision and returns the previous value. digits('default') resets the setting to 32.
Syntax
d = digits
old = digits(d)
old = digits('default')Inputs
| Name | Type | Required | Default | Description |
|---|---|---|---|---|
d | Any | No | — | New digit count, or 'default' to reset to 32. |
Returns
| Name | Type | Description |
|---|---|---|
d | NumericScalar | Current or previous variable-precision digit count. |
Errors
| Identifier | When | Message |
|---|---|---|
RunMat:digits:ArgCount | More than one input argument is supplied. | digits: too many input arguments |
RunMat:digits:InvalidDigits | The requested precision is not an integer in the supported range. | digits: expected a positive integer digit count |
How digits works
- The default value is 32 significant digits.
- Accepted digit counts are positive integer scalar values in the supported range.
- The setting affects later
vpa(x)calls that omit an explicit precision.
Example
Set and reset precision
old = digits(50)
x = vpa(sym('1/3'))
digits('default')Using digits with coding agents
Open a RunMat example with live inputs, then ask the agent to explain how digits changes the result.
Run a small digits example, explain the result, then change one input and compare the output.
FAQ
Does digits change ordinary double precision arithmetic?⌄
No. It only controls the default significant-digit count used by symbolic variable-precision operations such as vpa.
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 · realmin · 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 digits is executed, line by line, in Rust.
- View the source for digits 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.