How to set the number of decimals in report produced with knitr/pander?

Question

I know it\'s a fairly old problem, and it has been discussed before, but I can\'t get it work as expected.

I have a markdown document, and I would like to use

Answer 1

What about:

> library(pander)
> panderOptions('digits', 2)
> panderOptions('round', 2)
> panderOptions('keep.trailing.zeros', TRUE)
> pander(anova.m1)

----------------------------------------------------------
            Df   Sum Sq   Mean Sq   F value   Pr(>F) 
--------------- ---- -------- --------- --------- --------
   **feed**      5    231129    46226      15        0    

 **Residuals**   65   195556    3009                      
----------------------------------------------------------

Table: Analysis of Variance Table

> pander(coef(summary(model1)))

----------------------------------------------------------------
                Estimate   Std. Error   t value   Pr(>|t|) 
------------------- ---------- ------------ --------- ----------
  **(Intercept)**     323.58      15.83       20.44      0.00   

 **feedhorsebean**   -163.38      23.49       -6.96      0.00   

  **feedlinseed**    -104.83      22.39       -4.68      0.00   

 **feedmeatmeal**     -46.67      22.90       -2.04      0.05   

  **feedsoybean**     -77.15      21.58       -3.58      0.00   

 **feedsunflower**     5.33       22.39       0.24       0.81   
----------------------------------------------------------------

About inline R chunks: also call pander there or apply some hooks to do that automatically.

---

Update: there's no need to set the number of digits here as you are after setting the number of decimals, sry:

> library(pander)
> panderOptions('round', 2)
> panderOptions('keep.trailing.zeros', TRUE)
> model1 = lm(weight~feed, chickwts)
> anova.m1 = anova(model1)
> pander(anova.m1)

----------------------------------------------------------
            Df   Sum Sq   Mean Sq   F value   Pr(>F) 
--------------- ---- -------- --------- --------- --------
   **feed**      5    231129    46226     15.36      0    

 **Residuals**   65   195556    3009                      
----------------------------------------------------------

Table: Analysis of Variance Table

> pander(coef(summary(model1)))

----------------------------------------------------------------
                Estimate   Std. Error   t value   Pr(>|t|) 
------------------- ---------- ------------ --------- ----------
  **(Intercept)**     323.58      15.83       20.44      0.00   

 **feedhorsebean**   -163.38      23.49       -6.96      0.00   

  **feedlinseed**    -104.83      22.39       -4.68      0.00   

 **feedmeatmeal**     -46.67      22.90       -2.04      0.05   

  **feedsoybean**     -77.15      21.58       -3.58      0.00   

 **feedsunflower**     5.33       22.39       0.24       0.81   
----------------------------------------------------------------

---

Further update: and why it worked with set digits in the second table for the first run:

> format(c(0.01, 15.36 ), digits = 2)
[1] " 0.01" "15.36"
> format(15.36, digits = 2)
[1] "15"

And pandoc.table runs format on a column-basis so that the numbers in a column would have the same number of decimals (even trailing zeros with that option set to TRUE) based on a user-request.

Please open an issue at GitHub if this would look like a bug: https://github.com/Rapporter/pander

Answer 2

Have you tried

 options(scipen=1, digits=2)

as in http://yihui.name/knitr/demo/output/ ?