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getting elements out of list automatically

3 messages · stephen sefick, jim holtman

#
o <- (structure(list(sand.silt = structure(list(statistic =
structure(185, .Names = "W"),
    parameter = NULL, p.value = 0.0478835773838087, null.value =
structure(0, .Names = "location shift"),
    alternative = "two.sided", method = "Wilcoxon rank sum test with
continuity correction",
    data.name = ".column by site"), .Names = c("statistic", "parameter",
"p.value", "null.value", "alternative", "method", "data.name"
), class = "htest"), gravel = structure(list(statistic =
structure(249.5, .Names = "W"),
    parameter = NULL, p.value = 0.528568586705971, null.value =
structure(0, .Names = "location shift"),
    alternative = "two.sided", method = "Wilcoxon rank sum test with
continuity correction",
    data.name = ".column by site"), .Names = c("statistic", "parameter",
"p.value", "null.value", "alternative", "method", "data.name"
), class = "htest"), cobble = structure(list(statistic =
structure(340, .Names = "W"),
    parameter = NULL, p.value = 0.195229999724195, null.value =
structure(0, .Names = "location shift"),
    alternative = "two.sided", method = "Wilcoxon rank sum test with
continuity correction",
    data.name = ".column by site"), .Names = c("statistic", "parameter",
"p.value", "null.value", "alternative", "method", "data.name"
), class = "htest"), boulder.bedrock = structure(list(statistic =
structure(368, .Names = "W"),
    parameter = NULL, p.value = 0.0193433582385429, null.value =
structure(0, .Names = "location shift"),
    alternative = "two.sided", method = "Wilcoxon rank sum test with
continuity correction",
    data.name = ".column by site"), .Names = c("statistic", "parameter",
"p.value", "null.value", "alternative", "method", "data.name"
), class = "htest"), fine.root = structure(list(statistic =
structure(395.5, .Names = "W"),
    parameter = NULL, p.value = 0.0147991488721795, null.value =
structure(0, .Names = "location shift"),
    alternative = "two.sided", method = "Wilcoxon rank sum test with
continuity correction",
    data.name = ".column by site"), .Names = c("statistic", "parameter",
"p.value", "null.value", "alternative", "method", "data.name"
), class = "htest"), course.root = structure(list(statistic =
structure(244.5, .Names = "W"),
    parameter = NULL, p.value = 0.202661704288995, null.value =
structure(0, .Names = "location shift"),
    alternative = "two.sided", method = "Wilcoxon rank sum test with
continuity correction",
    data.name = ".column by site"), .Names = c("statistic", "parameter",
"p.value", "null.value", "alternative", "method", "data.name"
), class = "htest"), wood = structure(list(statistic =
structure(289.5, .Names = "W"),
    parameter = NULL, p.value = 0.82819937730819, null.value =
structure(0, .Names = "location shift"),
    alternative = "two.sided", method = "Wilcoxon rank sum test with
continuity correction",
    data.name = ".column by site"), .Names = c("statistic", "parameter",
"p.value", "null.value", "alternative", "method", "data.name"
), class = "htest"), leaf = structure(list(statistic = structure(257,
.Names = "W"),
    parameter = NULL, p.value = 0.566029791094808, null.value =
structure(0, .Names = "location shift"),
    alternative = "two.sided", method = "Wilcoxon rank sum test with
continuity correction",
    data.name = ".column by site"), .Names = c("statistic", "parameter",
"p.value", "null.value", "alternative", "method", "data.name"
), class = "htest"), leaf.sand = structure(list(statistic =
structure(194, .Names = "W"),
    parameter = NULL, p.value = 0.0149634957806214, null.value =
structure(0, .Names = "location shift"),
    alternative = "two.sided", method = "Wilcoxon rank sum test with
continuity correction",
    data.name = ".column by site"), .Names = c("statistic", "parameter",
"p.value", "null.value", "alternative", "method", "data.name"
), class = "htest"), veg = structure(list(statistic = structure(399.5,
.Names = "W"),
    parameter = NULL, p.value = 0.0091447786580201, null.value =
structure(0, .Names = "location shift"),
    alternative = "two.sided", method = "Wilcoxon rank sum test with
continuity correction",
    data.name = ".column by site"), .Names = c("statistic", "parameter",
"p.value", "null.value", "alternative", "method", "data.name"
), class = "htest"), pool = structure(list(statistic = structure(273,
.Names = "W"),
    parameter = NULL, p.value = 0.776755854519814, null.value =
structure(0, .Names = "location shift"),
    alternative = "two.sided", method = "Wilcoxon rank sum test with
continuity correction",
    data.name = ".column by site"), .Names = c("statistic", "parameter",
"p.value", "null.value", "alternative", "method", "data.name"
), class = "htest")), .Names = c("sand.silt", "gravel", "cobble",
"boulder.bedrock", "fine.root", "course.root", "wood", "leaf",
"leaf.sand", "veg", "pool")))


I know that I can get the elements of this list that I want by

test <- rbind(c(o$veg$p.value, o$veg$statistic), c(o$pool$p.value,
o$pool$statistic))
colnames(test) <- c("p.value", "W")

is there any way to automate this process
#
yes sorry for not being clearer.  Thank you very much.
regards,

Stephen Sefick
On Tue, Jun 2, 2009 at 4:37 PM, jim holtman <jholtman at gmail.com> wrote: