I've a set of tables that I'm generating with use of the code similar to the snippet below:
```{r tables, echo=TRUE, eval=TRUE}
require(reshape2); require(pander)
data("mtcars")
data("AirPassengers")
dta_lst <- list(mtcars, AirPassengers)
for (i in 1:length(dta_lst)) {
pander(melt(head(dta_lst[[i]], n = 2), varnames = c("Something"),
value.name = "Something else"),
caption = paste("Some table for: ", class(dta_lst[[i]])))
}
```
When I run the code it produces the desired output (naturally, the provided example makes little sense, in my proper data I melt the data in sensible manner):
---------------------------
variable Something else
---------- ----------------
mpg 21
mpg 21
cyl 6
cyl 6
disp 160
disp 160
hp 110
hp 110
drat 3.9
drat 3.9
wt 2.62
wt 2.875
qsec 16.46
qsec 17.02
vs 0
vs 0
am 1
am 1
gear 4
gear 4
carb 4
carb 4
---------------------------
Table: Some table for: data.frame
----------------
Something else
----------------
112
118
----------------
Table: Some table for: ts
When I attempt to knit the code in Rstudio the pander tables do not appear:
Naturally, without the loop the pander command works just fine and generates the tables that are neatly knitted into a HTML document.
In the for loop there is not 'output screen' unless you use the print(x) function.
for (i in 1:4) { i } does not display anything
for (i in 1:4) {print(i)} displays the Numbers 1 2 3 and 4
Solution: In the FOR loop construct the table (using knitt) and assign it into a variable. Then print out this variable using print() function. Remember. You Must add blank lines after and before the var table: use paste function inside print()
来源：https://stackoverflow.com/questions/31491417/generating-pander-tables-in-a-loop-in-rmarkdown-in-rstudio