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Douglas Leaffer


Last seen: 7 months ago |  Active since 2021

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Environmental Engineer focusing on engineered solutions to measure, monitor and mitigate adverse health impacts from noise and air pollution. PhD, Tufts University (MA) in Civil & Environmental Engineering.

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heatmap help - how to display grouped data across 3 levels (LO, MED, HI) ?
How can I show 3 levels in a heatmap (LO MED, HI) and not just two (FALSE, TRUE for example) across n=4 GROUPS for a single outc...

11 months ago | 2 answers | 0

2

answers

Answered
Normalized Wind Rose Plot help
Hello, it seems the plots generated from these suggested answers are not what I need. I need a normalized [0 1] wind rose of U...

11 months ago | 0

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Reformat and Merge Date and Time columns
Hello. Could use some help merging the Date and Time columns in the attached data file. Date (Column 1) is a DateTime vector dd-...

1 year ago | 2 answers | 1

2

answers

Question


Help with student grades categorization for ANOVA-n
Hello. I need some help formatting a table (attached) of student grades for an ANOVA-n analysis. I want to perform the ANOVA-n w...

1 year ago | 1 answer | 0

1

answer

Question


Normalized Wind Rose Plot help
I am trying to generate a normalized (to the max) wind rose plot of air pollutant concentration (UFP) by wind direction. See pho...

1 year ago | 2 answers | 0

2

answers

Question


vertcat errors - need a 'workaround' solution
Please suggest a 'workaround' or alternate solution for the following error (code and data tables attached) "An error occurred ...

1 year ago | 1 answer | 0

1

answer

Question


Need advice for coding dummyvar vectors - Regression
How should I properly code dummvar vectors for use in regression analysis in MATLAB? I have attached a sample table of data (.xl...

1 year ago | 1 answer | 0

1

answer

Question


How do I add column headers (variable names) to a dummyvar table?
I could use some help adding column headers (variable names) to a dummyvar table? My code is attached. The table (tbl) once conv...

1 year ago | 0 answers | 0

0

answers

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How to add seconds to a HH:mm DateTime array ?
How do I add seconds as: ss = 00 to a datetime array of the form MM/dd/YYYY HH:mm: 04/15/2016 01:00 as an example

1 year ago | 3 answers | 0

3

answers

Question


how to create wind direction categoricals
Hello. I m trying to create categoricals from wind directions (0 - 359 degrees) for 4 values: 1 = airport; 2 = bus_sta; 3= road;...

1 year ago | 1 answer | 0

1

answer

Question


How do I replace (or remove) <undefined> with NaN in a categorical array ?
How do I replace (or remove) <undefined> with NaN in a categorical array ? .dat file excerpt is attached. Thanks for any help ! ...

2 years ago | 1 answer | 0

1

answer

Question


How do I convert tall array duration time vector to HH:mm:ss for merging with tall array datetime vector ?
Need some help with this. I have a tall array date vector 'yyyy-MM-dd' of datetime format, and a tall array time vector 'HH:mm:s...

3 years ago | 2 answers | 0

2

answers

Answered
Hey there, I am trying to write a code for 2D-Mohr's circle and i need to generate a circle for x value of Sx, radius(r) of T.
ADD the following function call to your script: circle((S1+S2)/2, 0, Tm) % function call Then create a new function and save t...

3 years ago | 0