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Downsample image using PSF

Hi, I am trying to perform ATPRK to downscale a satellite image. The image to be downscaled has 460m while the covariate I am using has 100m pixel size (so the scale factor is 4.6).
I already perform the downscaling in R without accounting for the PSF. But the problem is that in R there isn't any package/library that downsamples an image using a Gaussian filter.

Matlab:

When I try to downsample the covariate to match the pixel size of my coarse resolution image I am getting all sorts of errors. Here is an example of the errors I am getting:

Error using [repmat](matlab:matlab.internal.language.introspective.errorDocCallback('repmat'))
Replication factors must be a row vector of integers or integer scalars.

Error in [Extend_plane](matlab:matlab.internal.language.introspective.errorDocCallback('Extend_plane', '/MATLAB Drive/z/Copy_of_Code-for-S2-fusion-master/Extend_plane.m', 2)) ([line 2](matlab: opentoline('/MATLAB Drive/z/Copy_of_Code-for-S2-fusion-master/Extend_plane.m',2,0)))
Z_extend1=[repmat(Z(:,1),[1,w]),Z,repmat(Z(:,end),[1,w])];%%%extend columns

Error in [dowmsample_plane](matlab:matlab.internal.language.introspective.errorDocCallback('dowmsample_plane', '/MATLAB Drive/z/Copy_of_Code-for-S2-fusion-master/dowmsample_plane.m', 2)) ([line 2](matlab: opentoline('/MATLAB Drive/z/Copy_of_Code-for-S2-fusion-master/dowmsample_plane.m',2,0)))
plane=Extend_plane(plane,w*s);

Error in [ATPRK_PANsharpen](matlab:matlab.internal.language.introspective.errorDocCallback('ATPRK_PANsharpen', '/MATLAB Drive/z/Copy_of_Code-for-S2-fusion-master/ATPRK_PANsharpen.m', 7)) ([line 7](matlab: opentoline('/MATLAB Drive/z/Copy_of_Code-for-S2-fusion-master/ATPRK_PANsharpen.m',7,0)))
PAN_upscaled=dowmsample_plane(PAN,s,w,PSF);

Error in [ATPRK_for_pan_sharpening](matlab:matlab.internal.language.introspective.errorDocCallback('ATPRK_for_pan_sharpening', '/MATLAB Drive/z/Copy_of_Code-for-S2-fusion-master/ATPRK_for_pan_sharpening.m', 22)) ([line 22](matlab: opentoline('/MATLAB Drive/z/Copy_of_Code-for-S2-fusion-master/ATPRK_for_pan_sharpening.m',22,0)))
    [xrc1,RB0,Z0]=ATPRK_PANsharpen(I_MS(:,:,i),I_PAN,Sill_min,Range_min,L_sill,L_range,rate,H,w,PSFh);

I was wondering if you could help me downsample my image using the PSF. I don't need the entire ATPRK method.

Many thanks.

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