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【初心者向け】Rからxtableを用いて掛け算九九表のHTMLを出力する。

Last updated at Posted at 2020-03-12

多くの人が腕試しに試みてるので私も挑戦してみました。

1x 2x 3x 4x 5x 6x 7x 8x 9x
1y 1 2 3 4 5 6 7 8 9
2y 2 4 6 8 10 12 14 16 18
3y 3 6 9 12 15 18 21 24 27
4y 4 8 12 16 20 24 28 32 36
5y 5 10 15 20 25 30 35 40 45
6y 6 12 18 24 30 36 42 48 54
7y 7 14 21 28 35 42 49 56 63
8y 8 16 24 32 40 48 56 64 72
9y 9 18 27 36 45 54 63 72 81
#各段の準備
Step1<-c(1:9)
Step2<-as.integer(Step1*2)
Step3<-as.integer(Step1*3)
Step4<-as.integer(Step1*4)
Step5<-as.integer(Step1*5)
Step6<-as.integer(Step1*6)
Step7<-as.integer(Step1*7)
Step8<-as.integer(Step1*8)
Step9<-as.integer(Step1*9)

#MT=Multiplication Table(九九の英訳)
MT<- data.frame(S1=Step1,S2=Step2,S3=Step3,S4=Step4,S5=Step5,S6=Step6,S7=Step7,S8=Step8,S9=Step9)

#段の名前設定
colnames(MT)<-c("1x","2x","3x","4x","5x","6x","7x","8x","9x")
rownames(MT)<-c("1y","2y","3y","4y","5y","6y","7y","8y","9y")

#HTML出力
library(xtable)
print(xtable(MT),type="html")

型変換が必要なのが盲点でした…まぁ、普段はあまり意識しませんからね。
ナウい言語は暗黙の整数拡張を行わないか?

ちなみに「九九を巡る数理」は案外深く、色々な展開が考えられたりします。
【Rで九九】どうして36個の数字しか使われないのか?

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