MATLAB: I need to compare fields in two separate structures, and for the identical field indices, change value of another field within one of the structure. Step 1 is comparing the fields. Is there a simple way to compare them

field comparisonstructure comparison

I have two structures with multiple fields. I need to compare field A of Structure 1 with field B in structure 2 and find the indices of the same records. For these records, I need to change values in field C in Structure 1 with values in field D in Structure 2. But I am stuck in step 1 of comparing the two fields. I have tried ismember but that didn't work. Is there a simpler way to compare fields in structure?

Thank you.

Best Answer

Okay, this line worked for finding the indices:

[ind, ~]= find(ismember({structure1(:).fieldA}', {structure2(:).fieldB}')

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MATLAB: Comparing two structures and find the common

common_fields = intersect( fieldnames(structure1), fieldnames(structure2));
for fn = common_fields
    this = fn{1};
    new_struct(1).(this) = structure1.(this);
    new_struct(2).(this) = structure2.(this);
end

MATLAB: How to compare string array with the names of structure’s fields.

 S.a = {'First field'};
 S.b = {'Second field, entry 1','Second field,entry 2'};
 S.c = {1,2,3};
 mystring = {'a','game','matlab','c'};
 [~,indx] = ismember(fieldnames(S),mystring);
 all = arrayfun(@(x) getfield(S,mystring{x}),indx(indx>0),'un',0);

all{:} =

 {'First field'}
 {[1]}    {[2]}    {[3]}

Best Answer

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MATLAB: Comparing two structures and find the common

MATLAB: How to compare string array with the names of structure’s fields.

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