Nothing
is.decreasing.on.x <-
function(fun, x.bound=c(-1,1), y.bound=c(-1,1), step=.01){
y = seq(y.bound[1], y.bound[2], by=step)
for(i in 1:length(y)){
g = function(x) fun(x,y[i])
if( is.decreasing(g, x.bound, step) == FALSE )
{ return(FALSE) }
}
return( TRUE )
}
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