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Bug in Origin 6 with SR1, SR2, SR3 and SR4

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[quote][i]Originally posted by tantiger[/i]
[br]This bug is related to the differentiation function in Origin. Before apply SR1, this function is correct only for sine ( and other triangle functions), others like y=x^2 cannot get right results. After apply SR1, you cannot get a correct result for sine (and other triangle functions), however, others like y=x^2 can.To re-produce the bug: just fill 2 columns, say A, B with Col(A)=0 to 360, and col(B)=sin(col(A)), plot col(B) then choose Analysis->Calcalus->Diff, The result is a cosine-like curve, however, the maximum is reduced to around 0.02 not the value it should be (should be 1).However, if you fill the second column with col(A)^2, you can get the right result.I think it should be the SRs, when apply those SRs, it changed some function relating to differentiation accidentally.Hope someone can fix this problem as soon as possible, as there could be other functions cannot be correctly derived. [This message has been edited by tantiger (edited 06-22-2000).]
[/quote]

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T O P I C R E V I E W
tantiger	Posted - 06/22/2000 : 9:49:00 PM This bug is related to the differentiation function in Origin. Before apply SR1, this function is correct only for sine ( and other triangle functions), others like y=x^2 cannot get right results. After apply SR1, you cannot get a correct result for sine (and other triangle functions), however, others like y=x^2 can. To re-produce the bug: just fill 2 columns, say A, B with Col(A)=0 to 360, and col(B)=sin(col(A)), plot col(B) then choose Analysis->Calcalus->Diff, The result is a cosine-like curve, however, the maximum is reduced to around 0.02 not the value it should be (should be 1). However, if you fill the second column with col(A)^2, you can get the right result. I think it should be the SRs, when apply those SRs, it changed some function relating to differentiation accidentally. Hope someone can fix this problem as soon as possible, as there could be other functions cannot be correctly derived. [This message has been edited by tantiger (edited 06-22-2000).]
2 L A T E S T R E P L I E S (Newest First)
rtoomey	Posted - 06/26/2000 : 1:20:00 PM Tantiger and ru_pro In response to your interest in how our differentiation feature works, a Knowledge Base item has been prepared. Please take a look at it since it should clear up any confusion. If you would like to link to it directly, please click here. I think you will find that the explanation proves the bug was actually in 6.0 release and not SR1. I also think you will find that using radians is not a "quick fix", but rather the correct angular unit to use if you expect the differentiation to yield "theoretical" results. Sincerely, Ryan Toomey
ru_pro	Posted - 06/23/2000 : 8:45:00 PM The quick fix is to use radians instead of degrees - differentiation works fine then. (That's why it works ok for non trigonometric functions).

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