Table rendering in pdf document using R markdown - r

Question

After days trying to find a solution, I give up and ask for help.
I decided to use R Markdown very recently. While I can render plots as I want, I cannot succeed in rendering my tables in a pdf doc properly.
Here the corresponding [EDITED]code:
---
title: "My_title"
output:
pdf_document: default
html_document:
df_print: paged
params:
date: "!r Sys.Date()"
---
```{r library, echo=F, message=F, warning=F, paged.print=FALSE}
suppressMessages(library("knitr"))
suppressMessages(library(reshape2))
suppressMessages(library(splines))
suppressMessages(library(kableExtra))
suppressMessages(library(gplots))
```
```{r, setup, echo = F}
opts_knit$set(root.dir = "my_path")
knitr::opts_chunk$set(echo = F)
```
```{r}
dt <- expand.grid(Region=c("a","b","c"), Country=c("d","e","f"), Cancer= c("All", "CRC", "Breast"),
age.1.1=1:2,
age.1.2=1:2,
age.1.3=1:2)
```
```{r Table_1, INCLUDE = TRUE}
cancer.lab <- c("All", "CRC", "Breast")
for (i in 1:3){
b <- dt[dt$Cancer==cancer.lab[i],]
b <- b[,-3]
t <- kable(b, format = ,caption = "Fig", row.names = F) %>%
kable_paper() %>%
kable_styling(font_size = 9) %>%
add_header_above(c(" " = 2, "1998" = 3))
print(t)
}
```
Again I am new and I surely miss something.
I use Mac if it may explain something.
Thank you for your help.
Sophie.

Answer 1

I think this is the same issue as dealt with here: https://stackoverflow.com/a/53632154/2554330. The problem is that you need to use knit_print to print the tables, but you can't do that in a loop.
So if you change the last code chunk to this, it should work:
```{r Table_1, INCLUDE = TRUE}
results <- c()
cancer.lab <- c("All", "CRC", "Breast")
for (i in 1:3){
b <- dt[dt$Cancer==cancer.lab[i],]
b <- b[,-3]
t <- kable(b, format = ,caption = "Fig", row.names = F) %>%
kable_paper() %>%
kable_styling(font_size = 9) %>%
add_header_above(c(" " = 2, "1998" = 3))
results <- c(results, knit_print(t))
}
asis_output(results)
```