MATLAB: Extracting fields from structures with varying names.

structuresworkspace

Hi I have several structures on my workspace. Their names are unrelated (e.g. "data_23_200_600_451", "data_58_588_154_289" etc.), but they all have identical field names. The tricky names of the structures make it difficult to extract the the same field in all structures using a loop (i.e. the names are not 'data_1', 'data_2' etc.) Is there any other method to automatically extract the fields from these structures? Thank you!

Best Answer

Use this example to see if it helps to resolve your issue

clear;
data_23_200_600_451=struct('strings',{{'hello','yes'}},'lengths',[5 3]);
data_58_588_154_289=struct('strings',{{'abc','efg'}},'lengths',[5 3]);
save;
Vars=load;
StructNames=fieldnames(Vars);
for k=1:numel(StructNames)
    Vars.(StructNames{k}).strings
end

Related Solutions

MATLAB: How to summon a double variable that it’s name was stored in a string

Use eval. For example

xxx = 3;     % variable with value
varname = 'xxx';    % name of variable stored as a string
% ... other stuff ...
val_of_xxx = eval(varname);   % gets back value of xxx

But think carefully about whether you really need to do this. It's often the case that there's a better way to write your program, perhaps using structure arrays or cell arrays, that avoids having to store variable names as strings. If there is, it's usually much better to avoid using eval.

MATLAB: Sum of all the variables in workspace how to find

clear all;
x=10;
y=2;
z=3;
allvariables = whos; 
sumOfVars = 0; 
for i = 1:length(allvariables)
    sumOfVars = sumOfVars + eval(allvariables(i).name);
end

Best Answer

Related Solutions

MATLAB: How to summon a double variable that it’s name was stored in a string

MATLAB: Sum of all the variables in workspace how to find

Related Question