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How can I link data from separate arrays?

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Matthew Weltevreden
Matthew Weltevreden on 26 Feb 2021
Commented: dpb on 27 Feb 2021
Suppose you have an array [4 7 9 4 8 3] which represents a list of parameter values within a database. For example ‘4’ is the thickness of a plate which has an associated array containing location and temperature values (5x2 double) [0.55 0.16; 0.60 0.16; 0.65 0.15; 0.7 0.14; 0.75 0.12]. Each of the thickness values has an associated 5x2 array which is unique.
So the question I have is this: Is there a way I can link the location and temperature data arrays with the thickness values so that I can plot all the arrays which correspond to thickness value of ‘4’ without doing this manually?
  5 Comments
Matthew Weltevreden
Matthew Weltevreden on 26 Feb 2021
field1 = 'Data1';
field2 = 'Data2';
field3 = 'Data3';
Thickness1 = 19.0;
Thickness2 = 22.0;
Thickness3 = 32.0;
Temp_data1 = [0,-0.05;0.2,-0.13;0.4,0.25;0.6,0.64;0.8,0.56;1,-0.063];
Temp_data2 = [0,0.36;0.2,-0.15;0.4,-0.1;0.6,0.21;0.8,0.47;1,0.35];
Temp_data3 = [0,0.64;0.2,-0.22;0.4,-0.42;0.6,-0.11;0.8,0.28;1,-0.027];
value1={Thickness1,Temp_data1};
value2={Thickness2,Temp_data2};
value3={Thickness3,Temp_data3};
database = struct(field1,value1,field2,value2,field3,value3);
input_thickness = 20;
I've provided some more information to help with the question, assuming the data is part of a struct i would like to extract all the temp data which is larger than a given input thickness in this case 20 (i.e. Temp_data2 & Temp_data3)

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Accepted Answer

dpb
dpb on 26 Feb 2021
Edited: dpb on 26 Feb 2021
Making harder than needs must be --
Thickness=[19.0;22.0;32.0];
Temp_data=cat(3l [0,-0.05;0.2,-0.13;0.4,0.25;0.6,0.64;0.8,0.56;1,-0.063];
[0,0.36;0.2,-0.15;0.4,-0.1;0.6,0.21;0.8,0.47;1,0.35];
[0,0.64;0.2,-0.22;0.4,-0.42;0.6,-0.11;0.8,0.28;1,-0.027]);
input_thickness = 20;
isWanted=(Thickness>input_thickness); % logical vector of locations wanted
data=Temp_data(:,:,isWanted); % return temperature data wanted
  5 Comments
dpb
dpb on 27 Feb 2021
That would then require something like the table with the 2D arrays a cells; you wouldn't be able to use the 3D array "trick" as the planes have to be the same dimension(*) to do that.
(*) It would require augmenting to the maximum size with NaN or somesuch to do that.

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More Answers (1)

Hernia Baby
Hernia Baby on 26 Feb 2021
The code below is one I assumed from your infomation.
Therefore, it might be different from what you want to do.
As the other members said, you need to give us enough input data.
Thickness = [4 7 9 4 8 3];
% create datas by the number of thickness datas
name = ("parts"+char('A'+(0:length(Thickness)-1'))');
LocTemp(:,:,1) = [0.55 0.16; 0.60 0.16; 0.65 0.15; 0.7 0.14; 0.75 0.12];
for i = 1:length(Thickness)-1
LocTemp(:,:,i+1) = LocTemp(:,:,i) + 0.01;
end
% seperate data into location and temperature
Location = squeeze(LocTemp(:,1,:))';
Temperature = squeeze(LocTemp(:,2,:))';
% integration as cell type
for i = 1:length(Thickness)
C(i,:) = {name(i),Thickness(i),Location(i,:),Temperature(i,:)};
end
% legends
leg = {'name' 'thickness' 'location' 'temperature'};
% convert type
S = cell2struct(C, leg, 2);
% output example
S(1)
>> S(1)
name: "partsA"
thickness: 4
location: [0.5500 0.6000 0.6500 0.7000 0.7500]
temperature: [0.1600 0.1600 0.1500 0.1400 0.1200]
  1 Comment
Matthew Weltevreden
Matthew Weltevreden on 26 Feb 2021
also works very well with previous example! Thank you!

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