# What is the bicubic interpolation function in Julia
**URL:** https://discourse.julialang.org/t/what-is-the-bicubic-interpolation-function-in-julia/14060
**Category:** General Usage
**Tags:** question, images
**Created:** [August 26, 2018, 12:38am UTC](https://discourse.julialang.org/t/what-is-the-bicubic-interpolation-function-in-julia/14060 "2018-08-26T00:38:26Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@complexfilter](https://discourse.julialang.org/u/complexfilter)
#### Post date: [August 26, 2018, 12:38am UTC](https://discourse.julialang.org/t/what-is-the-bicubic-interpolation-function-in-julia/14060/1 "2018-08-26T00:38:26Z")
I wish to interpolate an image by a factor of 2, both horizontally and vertically. What is the bicubic interpolation operator in Julia that is the counterpart of interp2 in Matlab?
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### Author:  [@dfdx](https://discourse.julialang.org/u/dfdx)
#### Post date: [August 26, 2018, 12:59am UTC](https://discourse.julialang.org/t/what-is-the-bicubic-interpolation-function-in-julia/14060/2 "2018-08-26T00:59:21Z")
Take a look at [Interpolations.jl](https://github.com/JuliaMath/Interpolations.jl) package which has number of options for configuring interpolation algorithm.
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### Author:  [@complexfilter](https://discourse.julialang.org/u/complexfilter)
#### Post date: [August 26, 2018, 4:37am UTC](https://discourse.julialang.org/t/what-is-the-bicubic-interpolation-function-in-julia/14060/3 "2018-08-26T04:37:23Z")
Thanks to the rely. I am currently using:
using GR
X = Y = 1:2:512
Xq = Yq = 1:512
yy=y1[1:2:512,1:2:512]
Zq = interp2(X, Y, yy, Xq, Yq, 3)
(here y1 is a 512-by-512 matrix)
However, the result is slightly different from Matlab’s result.