Use logical indexing to create a new structure containing specific data from an excel file

The question asks to create a new structure from a data set for dogs. And do the same for cats. An excel file was given which a multitude of data (101 rows and 15 columns). The columns denoted things such as age, size, name, etc., in which one was designated for "species", which listed either dog or cat. The excel file was converted to a structure with the table2struct function.

file1 = readtable('Random.xlsx'); %use readtable function to load caregiver data

table = table2struct(file1)

How would I go about extracing all the data just for the dogs. No looping.

[Stephen23]

Do NOT call any variable TABLE, because this shadows the inbuilt TABLE function.

Answer 1

[Voss]

file1 = readtable('Random.xlsx') %use readtable function to load caregiver data 

file1 = 3×5 table
    Age       Size            Name         Species    Is_A_Good_Boy_or_Girl
    ___    __________    ______________    _______    _____________________

     2     {'small' }    {'Fido'      }    {'Dog'}            true         
     4     {'large' }    {'Mr Pickles'}    {'Cat'}            true         
     9     {'medium'}    {'Rex'       }    {'Dog'}            true         

table = table2struct(file1)

table = 3×1 struct array with fields:
    Age
    Size
    Name
    Species
    Is_A_Good_Boy_or_Girl

dog_data = table(strcmp({table.Species},'Dog'))

dog_data = 2×1 struct array with fields:
    Age
    Size
    Name
    Species
    Is_A_Good_Boy_or_Girl

[dog_data.Age]

ans = 1×2

2 9

{dog_data.Size}

ans = 1×2 cell array
    {'small'}    {'medium'}

{dog_data.Name}

ans = 1×2 cell array
    {'Fido'}    {'Rex'}

[dog_data.Is_A_Good_Boy_or_Girl]

ans = 1×2 logical array
   1   1

[Cam B]

Thank you. Also, how would I go about finding the number of dogs?

[Voss]

You're welcome!

file1 = readtable('Random.xlsx'); %use readtable function to load caregiver data
table = table2struct(file1);

% using the full struct array:
nnz(strcmp({table.Species},'Dog'))

ans = 2

% or, after creating the dog struct array:
dog_data = table(strcmp({table.Species},'Dog'));
numel(dog_data)

ans = 2