第九代碼疑義

[747]

book/09 府庫第九.md

Lines 73 to 78 in a56c27e

	吾有一術。名之曰「比」。欲行是術。必先得二數。名之曰「甲」。曰「乙」。乃行是術曰。
	若「甲」小於「乙」者。乃得負一也。
	若「甲」大於「乙」者。乃得一也。
	乃得零。
	注曰「「或云「減甲以乙乃得矣」亦可」」
	是謂「合」之術也。

此術已名「比」於跋，猶當結以是謂「比」之術也。

[747]

book/09 府庫第九.md

Line 89 in a56c27e

索一者。參者一列一元。於列中尋其元也。尋而得之者。乃得其序數也。首物等元者。得一。次物等元者。得二。不得者。乃得零也。

其中曰不得者。乃得零也。，乃與列經本文相悖。縱循彼文，未尋得者應得負一也。孰正孰非？

[LingDong-]

Hi @747 Thanks for spotting the mistakes!

• 合->比 now fixed: d807775

• 索一's return value: I thought about this, and ended up changing the standard library instead of changing the book :P Since in wenyan, arrays start at 1, I think it makes more sense to have 0 mean "not found". I did some searching and it seems like nobody is using the function anywhere yet. So I think it's safe to change the library.