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
 

Excel Facts

Which Excel functions can ignore hidden rows?
The SUBTOTAL and AGGREGATE functions ignore hidden rows. AGGREGATE can also exclude error cells and more.
Sort by date Sort by votes
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
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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
 
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