Grouping Categories in Scatter Plot

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Stephanie
Stephanie 2023-2-21
评论： Star Strider 2023-2-22
Hello everyone! I have a scatter plot that I am working on and am trying to figure out how to code the groups out. I need different colors to represent different groups. For example Hudson river, Nile river etc. I have 6 rivers. I tried to create a 6x1 line array but that isn't working. Any ideas?
  1 个评论
dpb
dpb 2023-2-21
As per usual, if you'll share the actual data or something similar, it gets much easier to write specific code.
You can pass either a color triplet array or a vector into the current colormap for each vector using scatter() if you have different vectors for each river or use a given color index/triplet for a specific grouping variable (the river ID) to plot all as a single vector.
plot() will cycle colors for each line in an array treating each column as a separate line; if the data lengths aren't the same for all groups/columns (rivers), then fill in to the length of the longest with NaN; those locations will be transparently ignored.

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回答（2 个）

Sulaymon Eshkabilov
Ran in:
If understood your question correctly, here is one example how to address this issue:
DATA = randi(100, 25, 1);
BIN = discretize(DATA, [1, 20, 41, 61, 81 100], 'categorical',{'Agrade', 'Bgrade', 'Cgrade', 'Dgrade', 'Egrade'});
hist(BIN)
Star Strider
Star Strider 2023-2-22
Ran in:
The gscatter function may be appropriate.
Is this the correct file? These don’t appear to have anything to do with rivers (although I didn’t look past what’s displayed here) ...
T1 = readtable('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1303475/WATEDR%20COPY%202.csv', 'VariableNamingRule','preserve')
T1 = 8541×9 table
Facility description Date collected Component Result entry Unit of measure Location description Test code Test status Sample status ____________________ ______________ _________________________ ____________ _______________ ________________________________________________________________ _____________ _____________ _____________ {'FELLS RESERVOIR'} 17-Aug-2010 {'Alkalinity' } 17.2 {'mg/L' } {'SURFACE DEPTH-WEST AREA NEAR GATEHOUSE (SHORE SITE FOR F1-S)'} {'ALK-AQTPO'} {'VALIDATED'} {'APPROVED'} {'FELLS RESERVOIR'} 17-Aug-2010 {'Ca Final' } 4010 {'ug/L' } {'SURFACE DEPTH-WEST AREA NEAR GATEHOUSE (SHORE SITE FOR F1-S)'} {'ICP-DWAXI'} {'VALIDATED'} {'APPROVED'} {'FELLS RESERVOIR'} 17-Aug-2010 {'Chlorophyll A' } 17 {'ug/L' } {'SURFACE DEPTH-WEST AREA NEAR GATEHOUSE (SHORE SITE FOR F1-S)'} {'CHLAAQFLU'} {'VALIDATED'} {'APPROVED'} {'FELLS RESERVOIR'} 17-Aug-2010 {'Cl' } 8.04 {'mg/L' } {'SURFACE DEPTH-WEST AREA NEAR GATEHOUSE (SHORE SITE FOR F1-S)'} {'ICA-AQICC'} {'VALIDATED'} {'APPROVED'} {'FELLS RESERVOIR'} 17-Aug-2010 {'DO' } 8.45 {'mg/L' } {'0.5M DEPTH-WEST AREA NEAR GATEHOUSE (SHORE SITE FOR F1*)' } {'DO--AQFLD'} {'VALIDATED'} {'APPROVED'} {'FELLS RESERVOIR'} 17-Aug-2010 {'DO Percent Saturation'} 102 {'%' } {'0.5M DEPTH-WEST AREA NEAR GATEHOUSE (SHORE SITE FOR F1*)' } {'DOPSAQFLD'} {'VALIDATED'} {'APPROVED'} {'FELLS RESERVOIR'} 17-Aug-2010 {'Depth to Bottom' } 0.2 {'m' } {'SURFACE DEPTH-WEST AREA NEAR GATEHOUSE (SHORE SITE FOR F1-S)'} {'TDEPAQFLD'} {'VALIDATED'} {'APPROVED'} {'FELLS RESERVOIR'} 17-Aug-2010 {'E. coli' } 37.9 {'MPN/100 mL'} {'SURFACE DEPTH-WEST AREA NEAR GATEHOUSE (SHORE SITE FOR F1-S)'} {'ECOLAQC18'} {'VALIDATED'} {'APPROVED'} {'FELLS RESERVOIR'} 17-Aug-2010 {'Fe Final' } 73 {'ug/L' } {'SURFACE DEPTH-WEST AREA NEAR GATEHOUSE (SHORE SITE FOR F1-S)'} {'ICP-DWAXI'} {'VALIDATED'} {'APPROVED'} {'FELLS RESERVOIR'} 17-Aug-2010 {'Fecal Coliform' } 62 {'CFU/100ML' } {'SURFACE DEPTH-WEST AREA NEAR GATEHOUSE (SHORE SITE FOR F1-S)'} {'FCOLAQMFL'} {'VALIDATED'} {'APPROVED'} {'FELLS RESERVOIR'} 17-Aug-2010 {'Hardness' } 13.6 {'mg/L' } {'SURFACE DEPTH-WEST AREA NEAR GATEHOUSE (SHORE SITE FOR F1-S)'} {'ICP-DWAXI'} {'VALIDATED'} {'APPROVED'} {'FELLS RESERVOIR'} 17-Aug-2010 {'Mg Final' } 880 {'ug/L' } {'SURFACE DEPTH-WEST AREA NEAR GATEHOUSE (SHORE SITE FOR F1-S)'} {'ICP-DWAXI'} {'VALIDATED'} {'APPROVED'} {'FELLS RESERVOIR'} 17-Aug-2010 {'Mn Final' } 19.6 {'ug/L' } {'SURFACE DEPTH-WEST AREA NEAR GATEHOUSE (SHORE SITE FOR F1-S)'} {'ICP-DWAXI'} {'VALIDATED'} {'APPROVED'} {'FELLS RESERVOIR'} 17-Aug-2010 {'NH3-N' } NaN {'mg/L' } {'SURFACE DEPTH-WEST AREA NEAR GATEHOUSE (SHORE SITE FOR F1-S)'} {'NUTFAQAAN'} {'VALIDATED'} {'APPROVED'} {'FELLS RESERVOIR'} 17-Aug-2010 {'NO32-N' } NaN {'mg/L' } {'SURFACE DEPTH-WEST AREA NEAR GATEHOUSE (SHORE SITE FOR F1-S)'} {'NUTFAQAAN'} {'VALIDATED'} {'APPROVED'} {'FELLS RESERVOIR'} 17-Aug-2010 {'Phaeophytin' } 1.79 {'ug/L' } {'SURFACE DEPTH-WEST AREA NEAR GATEHOUSE (SHORE SITE FOR F1-S)'} {'CHLAAQFLU'} {'VALIDATED'} {'APPROVED'}
T1(end-9:end,:)
ans = 10×9 table
Facility description Date collected Component Result entry Unit of measure Location description Test code Test status Sample status _____________________ ______________ ____________________ ____________ _______________ _______________________________________________________________________ _____________ _____________ _____________ {'SUDBURY RESERVOIR'} 26-Jul-2022 {'TempC' } 13.5 {'Deg-C'} {'SURFACE SAMPLE AT DAM (GATEHOUSE)' } {'TMPCAQFLD'} {'VALIDATED'} {'APPROVED'} {'SUDBURY RESERVOIR'} 26-Jul-2022 {'Turbidity' } 1.57 {'NTU' } {'Deepest location - near 42°18'28.74"N 71°29'42.6"W - bottom sample' } {'TURBAQFLD'} {'VALIDATED'} {'APPROVED'} {'SUDBURY RESERVOIR'} 26-Jul-2022 {'Turbidity' } 0.29 {'NTU' } {'Deepest location - near 42°18'28.74"N 71°29'42.6"W - surface sample'} {'TURBAQFLD'} {'VALIDATED'} {'APPROVED'} {'SUDBURY RESERVOIR'} 26-Jul-2022 {'Turbidity' } 1.12 {'NTU' } {'SURFACE SAMPLE AT DAM (GATEHOUSE)' } {'TURBAQFLD'} {'VALIDATED'} {'APPROVED'} {'SUDBURY RESERVOIR'} 26-Jul-2022 {'UV Scan Filename'} NaN {'-' } {'Deepest location - near 42°18'28.74"N 71°29'42.6"W - bottom sample' } {'UV--AQUVV'} {'VALIDATED'} {'APPROVED'} {'SUDBURY RESERVOIR'} 26-Jul-2022 {'UV Scan Filename'} NaN {'-' } {'Deepest location - near 42°18'28.74"N 71°29'42.6"W - surface sample'} {'UV--AQUVV'} {'VALIDATED'} {'APPROVED'} {'SUDBURY RESERVOIR'} 26-Jul-2022 {'UV Scan Filename'} NaN {'-' } {'SURFACE SAMPLE AT DAM (GATEHOUSE)' } {'UV--AQUVV'} {'VALIDATED'} {'APPROVED'} {'SUDBURY RESERVOIR'} 26-Jul-2022 {'pH' } 6.55 {'S.U.' } {'Deepest location - near 42°18'28.74"N 71°29'42.6"W - bottom sample' } {'PH--AQFLD'} {'VALIDATED'} {'APPROVED'} {'SUDBURY RESERVOIR'} 26-Jul-2022 {'pH' } 8.06 {'S.U.' } {'Deepest location - near 42°18'28.74"N 71°29'42.6"W - surface sample'} {'PH--AQFLD'} {'VALIDATED'} {'APPROVED'} {'SUDBURY RESERVOIR'} 26-Jul-2022 {'pH' } 6.59 {'S.U.' } {'SURFACE SAMPLE AT DAM (GATEHOUSE)' } {'PH--AQFLD'} {'VALIDATED'} {'APPROVED'}
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Image Analyst
Image Analyst 2023-2-22
So what are the two or three features/values that you will have along each axis in your scatter plot? Do you want a 2-D scatter or 3-D scatter (for 3 features/attributes)
Star Strider
Star Strider 2023-2-22
O.K. I cannot do anything meaningful with the information in that file, so use the link I provided to see if the gscatter function will do what you want.
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