Trouble converting table to scatterhistogram

Hi I'm getting a weird error when converting a table into a scatterhistogram. I want the rr_la values to be on the same line on the y-axis in two separate parallel data sets for S10 and S12. The regions will just be color coded.

s = scatterhistogram(tablerr_la,'subjects','rr_la','GroupVariable','segments');

The "tablerr_la" in question looks like this:

tablerr_la =

  32×3 table

    subjects      rr_la       segments
    ________    __________    ________

     'S10'       -0.030551    'basal' 
     'S10'       -0.040102    'basal' 
     'S10'       0.0016109    'basal' 
     'S10'       -0.020057    'basal' 
     'S10'       -0.033282    'basal' 
     'S10'       -0.024207    'basal' 
     'S10'       -0.050507    'mid'   
     'S10'       -0.020694    'mid'   
     'S10'       -0.020932    'mid'   
     'S10'       -0.035626    'mid'   
     'S10'       -0.081229    'mid'   
     'S10'       -0.023346    'mid'   
     'S10'       -0.026452    'apex'  
     'S10'       -0.017935    'apex'  
     'S10'       -0.037958    'apex'  
     'S10'      -0.0082094    'apex'  
     'S12'       -0.084489    'basal' 
     'S12'       -0.013217    'basal' 
     'S12'       -0.044645    'basal' 
     'S12'       -0.033263    'basal' 
     'S12'       -0.061952    'basal' 
     'S12'        -0.10665    'basal' 
     'S12'       -0.053985    'mid'   
     'S12'       -0.017043    'mid'   
     'S12'       -0.041353    'mid'   
     'S12'       -0.043656    'mid'   
     'S12'       -0.061401    'mid'   
     'S12'       -0.033157    'mid'   
     'S12'       0.0051804    'apex'  
     'S12'      -0.0054823    'apex'  
     'S12'       -0.071557    'apex'  
     'S12'       -0.043434    'apex'  

The error I get when compiling is this:

>> StrainPlots
Error using scatterhistogram (line 82)
Expected XData to be one of these types:

double, single, uint8, uint16, uint32, uint64, int8, int16, int32, int64, categorical

Error in StrainPlots (line 60)
s = scatterhistogram(tablerr_la,'subjects','rr_la','GroupVariable','segments');

There is also no such line as line 82 but thats part of my issue.

Answer 1

[John D'Errico]

The error was in scatterhistogram, line 82 of that code. (Yes, there are 82 lines in that function. In fact, it has more than 200 lines.) The error arises because you are passing that function data of a class it did not expect.

That is, two of the columns in your table are character strings, not categorical values.

You can convert them into categorical variables using:

help categorical

For example:

categorical({'S10','S12','S10'})
ans = 
  1×3 categorical array
     S10      S12      S10