umx (version 4.0.0)

xmu_dot_mat2dot: Return dot code for paths in a matrix

Description

Return dot code for paths in a matrix is a function which walks the rows and cols of a matrix. At each free cell, it creates a dot-string specifying the relevant path, e.g.:

ai1 -> var1 [label=".35"]

Its main use is to correctly generate paths (and their sources and sink objects) without depending on the label of the parameter.

It is highly customizable:

1. You can specify which cells to inspect, e.g. "lower".

2. You can choose how to interpret path direction, from = "cols".

3. You can choose the label for the from to ends of the path (by default, the matrix name is used).

4. Offer up a list of from and toLabel which will be indexed into for source and sink

5. You can set the number of arrows on a path (e.g. both).

6. If type is set, then sources and sinks added manifests and/or latents output (p)

Finally, you can pass in previous output and new paths will be concatenated to these.

Usage

xmu_dot_mat2dot(
  x,
  cells = c("diag", "lower", "lower_inc", "upper", "upper_inc", "any", "left"),
  from = c("rows", "cols"),
  fromLabel = NULL,
  toLabel = NULL,
  showFixed = FALSE,
  arrows = c("forward", "both", "back"),
  fromType = NULL,
  toType = NULL,
  digits = 2,
  model = NULL,
  SEstyle = FALSE,
  p = list(str = "", latents = c(), manifests = c())
)

Arguments

x

a umxMatrix() to make paths from.

cells

which cells to process: "any" (default), "diag", "lower", "upper". "left" is the left half (e.g. in a twin means matrix)

from

one of "rows", "columns"

fromLabel

= NULL. NULL = use matrix name (default). If one, if suffixed with index, length() > 1, index into list. "one" is special.

toLabel

= NULL. NULL = use matrix name (default). If one, if suffixed with index, length() > 1, index into list.

showFixed

= FALSE.

arrows

"forward" "both" or "back"

fromType

one of "latent" or "manifest" NULL (default) = don't accumulate new names.

toType

one of "latent" or "manifest" NULL (default) = don't accumulate new names.

digits

to round values to (default = 2).

model

If you want to get CIs, you can pass in the model (default = NULL).

SEstyle

If TRUE, CIs shown as "b(SE)" ("b [l,h]" if FALSE (default)). Ignored if model NULL.

p

input to build on. list(str = "", latents = c(), manifests = c())

Value

• list(str = "", latents = c(), manifests = c())

See Also

• plot()

Other Graphviz: xmu_dot_define_shapes(), xmu_dot_make_paths(), xmu_dot_make_residuals(), xmu_dot_maker(), xmu_dot_rank()

Examples

# NOT RUN {
# Make a lower 3 * 3 value= 1:6 (1, 4, 6 on the diag)
a_cp = umxMatrix("a_cp", "Lower", 3, 3, free = TRUE, values = 1:6)

# Get dot strings for lower triangle (default from and to based on row and column number)
out = xmu_dot_mat2dot(a_cp, cells = "lower", from = "cols", arrows = "both")
cat(out$str) # a_cp1 -> a_cp2 [dir = both label="2"];

# one arrow (the default = "forward")
out = xmu_dot_mat2dot(a_cp, cells = "lower", from = "cols")
cat(out$str) # a_cp1 -> a_cp2 [dir = forward label="2"];

# label to (rows) using var names

out = xmu_dot_mat2dot(a_cp, toLabel= paste0("v", 1:3), cells = "lower", from = "cols")
umx_msg(out$str) # a_cp1 -> v2 [dir = forward label="2"] ...

# First call also inits the plot struct
out = xmu_dot_mat2dot(a_cp, from = "rows", cells = "lower", arrows = "both", fromType = "latent")
out = xmu_dot_mat2dot(a_cp, from = "rows", cells = "diag", 
		toLabel= "common", toType = "manifest", p = out)
umx_msg(out$str); umx_msg(out$manifests); umx_msg(out$latents)

# ================================
# = Add found sinks to manifests =
# ================================
out = xmu_dot_mat2dot(a_cp, from= "rows", cells= "diag", 
		toLabel= c('a','b','c'), toType= "manifest");
umx_msg(out$manifests)

# ================================
# = Add found sources to latents =
# ================================
out = xmu_dot_mat2dot(a_cp, from= "rows", cells= "diag", 
		toLabel= c('a','b','c'), fromType= "latent");
umx_msg(out$latents)


# ========================
# = Label a means matrix =
# ========================

tmp = umxMatrix("expMean", "Full", 1, 4, free = TRUE, values = 1:4)
out = xmu_dot_mat2dot(tmp, cells = "left", from = "rows",
	fromLabel= "one", toLabel= c("v1", "v2")
)
cat(out$str)

# }
# NOT RUN {
# ==============================================
# = Get a string which includes CI information =
# ==============================================
data(demoOneFactor)
latents = c("g"); manifests = names(demoOneFactor)
m1 = umxRAM("xmu_dot", data = demoOneFactor, type = "cov",
	umxPath(latents, to = manifests),
	umxPath(var = manifests),
	umxPath(var = latents, fixedAt = 1.0)
)
m1 = umxCI(m1, run= "yes")
out = xmu_dot_mat2dot(m1$A, from = "cols", cells = "any", 
      toLabel= paste0("x", 1:5), fromType = "latent", model= m1);
umx_msg(out$str); umx_msg(out$latents)

# }
# NOT RUN {
# }