Description Usage Arguments Value See Also Examples
showtree
can be used to visualize the tree of delayed operations
carried by a DelayedArray object.
Use nseed
, seed
, or path
to access the number of seeds,
the seed, or the seed path of a DelayedArray object, respectively.
Use seedApply
to apply a function to the seeds of a
DelayedArray object.
1 2 3 4 5 6 7 
x, object 
Typically a DelayedArray object but can also be a DelayedOp object or a list where each element is a DelayedArray or DelayedOp object. 
show.node.dim 

FUN 
The function to be applied to each leaf in 
... 
Optional arguments to Additional arguments passed to methods for 
The number of seeds contained in x
for nseed
.
The seed contained in x
for seed
.
The path of the seed contained in object
for path
.
A list of length nseed(x)
for seedApply
.
simplify
to simplify the tree of delayed operations
carried by a DelayedArray object.
DelayedOp objects.
DelayedArray objects.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35  ## 
## showtree(), nseed(), and seed()
## 
m1 < matrix(runif(150), nrow=15, ncol=10)
M1 < DelayedArray(m1)
showtree(M1)
seed(M1)
M2 < log(t(M1[5:1, c(TRUE, FALSE)] + 10))[1, ]
showtree(M2)
## In the above example, the tree is linear i.e. all the operations
## are represented by unary nodes. The simplest way to know if a
## tree is linear is by counting its leaves with nseed():
nseed(M2) # only 1 leaf means the tree is linear
seed(M2)
dimnames(M1) < list(letters[1:15], LETTERS[1:10])
showtree(M1)
m2 < matrix(1:20, nrow=10)
Y < cbind(t(M1[ , 10:1]), DelayedArray(m2), M1[6:15, "A", drop=FALSE])
showtree(Y)
showtree(Y, show.node.dim=FALSE)
nseed(Y) # the tree is not linear
Z < t(Y[10:1, ])[1:15, ] + 0.4 * M1
showtree(Z)
nseed(Z) # the tree is not linear
## 
## seedApply()
## 
seedApply(Y, class)
seedApply(Y, dim)

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