interp1q — Legacy quick one-dimensional linear interpolation.
interp1q(X,V,Xq) is the legacy quick form of one-dimensional linear interpolation. It uses strictly increasing sample points and returns NaN for out-of-range query points.
Syntax
Vq = interp1q(X, V, Xq)Inputs
| Name | Type | Required | Default | Description |
|---|---|---|---|---|
X | Any | Yes | — | Strictly increasing sample locations. |
V | Any | Yes | — | Sample values. |
Xq | Any | Yes | — | Query locations. |
Returns
| Name | Type | Description |
|---|---|---|
Vq | NumericArray | Linearly interpolated query values. |
Errors
| Identifier | When | Message |
|---|---|---|
RunMat:interp1q:InvalidInput | Arguments cannot be converted to the legacy one-dimensional linear interpolation domain. | interp1q: invalid input |
RunMat:interp1q:Internal | Interpolation evaluation or output construction fails unexpectedly. | interp1q: internal interpolation failure |
How interp1q works
- Accepts exactly three inputs: sample locations
X, sample valuesV, and query locationsXq. Xmust be a finite strictly increasing vector with at least two points.Vmust be real or complex numeric data compatible withXusing the same sample-dimension rules asinterp1; complex values interpolate real and imaginary parts independently.- Complex
XandXqinputs are accepted when their imaginary parts are zero; interpolation coordinates must be real-valued and strictly increasing. - Vector-valued queries preserve scalar versus array shape for vector
V; matrixVreturnsnumel(Xq)by trailing-series dimensions. - Only linear interpolation is supported, matching the legacy quick-interpolation API.
Examples
Linear interpolation
vq = interp1q([1 2 3], [10 20 40], [1.5 2.5])Expected output:
vq = [15 30]Out-of-range query
vq = interp1q([1 2], [10 20], 3)Expected output:
vq = NaNComplex sample values
vq = interp1q([1 2 3], [10+1i 20+3i 40+7i], [1.5 2.5])Expected output:
vq = [15+2i 30+5i]Using interp1q with coding agents
Open a RunMat example with live inputs, then ask the agent to explain how interp1q changes the result.
Run a small interp1q example, explain the result, then change one input and compare the output.
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 interp1q is executed, line by line, in Rust.
- View the source for interp1q 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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