Import 3D matrix in .mat File

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SAC CSA
SAC CSA on 24 Dec 2021
Commented: SAC CSA on 26 Dec 2021
Hi, I have a file 'data.mat' attached. The file contain a 3D matrix with 128x128x128 dimension.
I would like to import this matrix attached to a matlab script.
Indeed, I would like to use directly matrix imported and name it by a variable, say, y which have three dimension
However, when I use the command
y=load('data.mat')
shows
1x1 struct
in workspace.
How to import the respective matrix using a script to shows
y 128x128x128 double
in workspace?
Thank you so much in advance.

Accepted Answer

Stephen23
Stephen23 on 24 Dec 2021
Edited: Stephen23 on 24 Dec 2021
"Hi, I have a file 'data.mat' attached. The file contain a 3D matrix with 128x128x128 dimension."
No, it does not. It actually contains 128 separately named variables, each of which is a 128x128 matrix.
Note that MAT files can store any MATLAB variable, so you could have saved one 3D array instead, as you wrote (but didn't). If you had, your task would be much simpler and more robust.
Also note that forcing pseudo-indices into the variable names also makes this task harder: if you had used simple and very efficient indexing instead (e.g. into one cell array) then your task would be simpler and more robust.
Lets look at your data, we can see that you do NOT have one 3D array but lots of separate matrices:
S = load('data.mat')
S = struct with fields:
Expression1: [128×128 double] Expression2: [128×128 double] Expression3: [128×128 double] Expression4: [128×128 double] Expression5: [128×128 double] Expression6: [128×128 double] Expression7: [128×128 double] Expression8: [128×128 double] Expression9: [128×128 double] Expression10: [128×128 double] Expression11: [128×128 double] Expression12: [128×128 double] Expression13: [128×128 double] Expression14: [128×128 double] Expression15: [128×128 double] Expression16: [128×128 double] Expression17: [128×128 double] Expression18: [128×128 double] Expression19: [128×128 double] Expression20: [128×128 double] Expression21: [128×128 double] Expression22: [128×128 double] Expression23: [128×128 double] Expression24: [128×128 double] Expression25: [128×128 double] Expression26: [128×128 double] Expression27: [128×128 double] Expression28: [128×128 double] Expression29: [128×128 double] Expression30: [128×128 double] Expression31: [128×128 double] Expression32: [128×128 double] Expression33: [128×128 double] Expression34: [128×128 double] Expression35: [128×128 double] Expression36: [128×128 double] Expression37: [128×128 double] Expression38: [128×128 double] Expression39: [128×128 double] Expression40: [128×128 double] Expression41: [128×128 double] Expression42: [128×128 double] Expression43: [128×128 double] Expression44: [128×128 double] Expression45: [128×128 double] Expression46: [128×128 double] Expression47: [128×128 double] Expression48: [128×128 double] Expression49: [128×128 double] Expression50: [128×128 double] Expression51: [128×128 double] Expression52: [128×128 double] Expression53: [128×128 double] Expression54: [128×128 double] Expression55: [128×128 double] Expression56: [128×128 double] Expression57: [128×128 double] Expression58: [128×128 double] Expression59: [128×128 double] Expression60: [128×128 double] Expression61: [128×128 double] Expression62: [128×128 double] Expression63: [128×128 double] Expression64: [128×128 double] Expression65: [128×128 double] Expression66: [128×128 double] Expression67: [128×128 double] Expression68: [128×128 double] Expression69: [128×128 double] Expression70: [128×128 double] Expression71: [128×128 double] Expression72: [128×128 double] Expression73: [128×128 double] Expression74: [128×128 double] Expression75: [128×128 double] Expression76: [128×128 double] Expression77: [128×128 double] Expression78: [128×128 double] Expression79: [128×128 double] Expression80: [128×128 double] Expression81: [128×128 double] Expression82: [128×128 double] Expression83: [128×128 double] Expression84: [128×128 double] Expression85: [128×128 double] Expression86: [128×128 double] Expression87: [128×128 double] Expression88: [128×128 double] Expression89: [128×128 double] Expression90: [128×128 double] Expression91: [128×128 double] Expression92: [128×128 double] Expression93: [128×128 double] Expression94: [128×128 double] Expression95: [128×128 double] Expression96: [128×128 double] Expression97: [128×128 double] Expression98: [128×128 double] Expression99: [128×128 double] Expression100: [128×128 double] Expression101: [128×128 double] Expression102: [128×128 double] Expression103: [128×128 double] Expression104: [128×128 double] Expression105: [128×128 double] Expression106: [128×128 double] Expression107: [128×128 double] Expression108: [128×128 double] Expression109: [128×128 double] Expression110: [128×128 double] Expression111: [128×128 double] Expression112: [128×128 double] Expression113: [128×128 double] Expression114: [128×128 double] Expression115: [128×128 double] Expression116: [128×128 double] Expression117: [128×128 double] Expression118: [128×128 double] Expression119: [128×128 double] Expression120: [128×128 double] Expression121: [128×128 double] Expression122: [128×128 double] Expression123: [128×128 double] Expression124: [128×128 double] Expression125: [128×128 double] Expression126: [128×128 double] Expression127: [128×128 double] Expression128: [128×128 double]
Because fields can change order, a robust approach would be something like this:
S = orderfields(S,compose("Expression%d",1:128));
C = struct2cell(S);
A = cat(3,C{:}) % and that is the output
A =
A(:,:,1) = 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
size(A) % yes, it has the correct size
ans = 1×3
128 128 128
  3 Comments
SAC CSA
SAC CSA on 26 Dec 2021
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More Answers (1)

KSSV
KSSV on 24 Dec 2021
y=load('data.mat')
names = fieldnames(y) ;
n = length(names);
iwant = zeros(128,128,n) ;
for i = 1:n
iwant(:,:,i) = getfield(y,names{i}) ;
end

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