I realized that my problem was not the image function but with the interp
function.
The default for the interp arguements xo and yo = 40, which is why I had a
40 X 40 square image.
Here is the revised command.
image(
interp(
ytar_rcayrtgy$V2, ytar_rcayrtgy$V4, ytar_rcayrtgy$V5,
xo=seq(min(ytar_rcayrtgy$V2), max(ytar_rcayrtgy$V2), length = 131),
yo=seq(min(ytar_rcayrtgy$V4),max(ytar_rcayrtgy$V4), length = 131)
)
)
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