highs and lows

D

dmheller

Board Regular
Joined
May 26, 2017
Messages
156
Office Version
  1. 365
I have seen several post about this in the past via search but i was hoping there was a better way to find the highs and lows than using 5 helper columns. I am wanting to find the low and high each time along with the date and time it happened.
I was hoping to do this with a Let formula. Please let me know if you can help.
thanks

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1725465507557.png
 

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Why Let? Why not use XLOOKUP?
=XLOOKUP(MIN(B:B),B:B,A:A)
=XLOOKUP(MIN(B:B),B:B,A:A)

Format as the same date/time format as the first column?
 
Upvote 0
What do you consider the high and low values?
These:

1725470231333.png



Or if you zoom in:

these?

1725470338785.png


is there a number of minimum samples that we have to consider before and after the max min value?
 
Upvote 0
The data you shared look like this:

1725471236051.png


not so much like the image you shared in post #4.

So how do you want do detect a low and high point?
 
Upvote 0
Yea, I cant post that much data trough xb22 it has a max.
Usually the up and down is greater than 10.
 
Upvote 0
I think this does what you want:

Excel Formula: 
=LET(d,A2:B455,top,TAKE(d,1),btm,TAKE(d,-1),mid,DROP(DROP(d,-1),1),crit1,DROP(d,2),crit2,DROP(d,-2),ctot,MAP(INDEX(mid,,2),INDEX(crit1,,2),INDEX(crit2,,2),LAMBDA(a,b,c,OR(AND(b<a,c<a),AND(b>a,c>a)))),out,VSTACK(top,FILTER(mid,ctot),btm),out)
 
Upvote 0
That gave a bunch of weird data unless i did something wrong.
i was hoping for 1 data point for the low then a high then a low then high and so on. It happens every 3 or 4 days i believe.
MIXING_TANK_20240903_161725(6122).csv
ABCD
1TANK LEVEL TimeTANK LEVEL ValueY
28/6/2024 3:3631.079678/6/202431.07967
38/6/2024 3:3731.070178/6/202431.06351
48/6/2024 3:3731.063518/6/202431.06357
58/6/2024 3:3731.063578/6/202431.04513
68/6/2024 3:3831.058598/6/202431.04593
78/6/2024 3:3831.047658/6/202431.04263
88/6/2024 3:3831.045138/6/202431.04913
98/6/2024 3:3931.045938/6/202431.03115
108/6/2024 3:3931.042638/6/202431.04324
118/6/2024 3:3931.049138/6/202431.05589
128/6/2024 3:4031.040688/6/202431.03492
138/6/2024 3:4031.031158/6/202431.04041
148/6/2024 3:4031.043248/6/202431.03543
158/6/2024 3:4131.038598/6/202431.03909
168/6/2024 3:4131.038598/6/202431.02741
178/6/2024 3:4131.055898/6/202431.03388
188/6/2024 3:4231.034928/6/202431.01957
198/6/2024 3:4231.040418/6/202431.02724
208/6/2024 3:4231.035438/6/202431.01078
218/6/2024 3:4331.039098/6/202431.01987
228/6/2024 3:4331.030478/6/202431.01926
238/6/2024 3:4331.027418/6/202431.0225
248/6/2024 3:4431.033888/6/202431.00755
258/6/2024 3:4431.019578/6/202431.02013
268/6/2024 3:4431.027248/6/202431.01206
278/6/2024 3:4531.014528/6/202431.01438
288/6/2024 3:4531.010788/6/202431.01001
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MIXING_TANK_20240903_161725(612
Cell Formulas
RangeFormula
C2:D75003C2=LET(d,A2:B455000,top,TAKE(d,1),btm,TAKE(d,-1),mid,DROP(DROP(d,-1),1),crit1,DROP(d,2),crit2,DROP(d,-2),ctot,MAP(INDEX(mid,,2),INDEX(crit1,,2),INDEX(crit2,,2),LAMBDA(a,b,c,OR(AND(b<a,c<a),AND(b>a,c>a)))),out,VSTACK(top,FILTER(mid,ctot),btm),out)
Dynamic array formulas.
 
Upvote 0
How are those wrong? The value in row 4 is lower than that in row 3 and in row 5 so it's a low. Row 5 is higher than row 4 and row 6 so that's a high. Are there other criteria you haven't mentioned?
 
Upvote 0
So there are roughly 125000 datapoints in my sheet. I am looking for the bottom and top of the big hills, not every little move.
The data i shared is only a little of the graph as again XL22 wont let me share more.
so out of all the noise on 8-6, i only want one data point for the low
then i know there is a high so i want that point as well.
this trend will then continue forever really where it will come down slow then go up and down slow then up.
1725486439079.png

1725486396246.png

1725486232795.png
 
Upvote 0
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