get the number of fields in a structure in matlab

To get the number of fields in a structure in Matlab, you can use the length function along with the fieldnames function. The fieldnames function returns a cell array containing the names of all the fields in the structure, which can then be passed to the length function to get the total number of fields in the structure.

Here's an example code snippet:

main.m
myStruct.field1 = 'hello';
myStruct.field2 = [1 2 3];
myStruct.field3 = struct();

numFields = length(fieldnames(myStruct));
disp(numFields); % Output: 3
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In this example, we first create a structure myStruct with three fields of different data types. We then use the fieldnames function to get an array of the names of all the fields in myStruct, and finally pass this array to the length function to get the total number of fields in the structure. The result, 3, is then printed to the console using the disp function.