Accessing data in matfile.

I have a matrix called miu. And the size of miu is ::: 262144x1 double

To save the memory purpose I have used:

    miu =matfile('miu_64cube_detect256multiply256.mat');
    miu.Properties.miu(ind)    %% To access the data I have used the line

Error Message: Unrecognized method, property, or field 'miu' for class 'matlab.io.matfile.Properties'.

Can anyone give me some clarification and probable solution regarding this problem?

Thank You....

[Rik]

Can you provide code that will reproduce this issue from scratch?

[Amit Chakraborty]

miu =matfile('miu_64cube_detect256multiply256.mat')
Nvoxels= 64*64*64
for j = 1:Nvoxels
        len = cell2mat(length_ijk(j));
        ind = cell2mat(index_ijk(j));
        atten(j) =  exp(-sum(miu(ind).*len));
end

I just gave here a small part!

[Rik]

miu =matfile('miu_64cube_detect256multiply256.mat');
Nvoxels= 64*64*64;
for j = 1:Nvoxels
        len = cell2mat(length_ijk(j));
        ind = cell2mat(index_ijk(j));
        atten(j) =  exp(-sum(miu(ind).*len));
end

Unrecognized function or variable 'length_ijk'.

[dpb]

Which doesn't do anything at all with the matfile object to address it and create the problem.

But, you don't address the Properties of the object, but the object itself with the variable name and index -- and, you don't have a LHS to store the result.

miu =matfile('miu_64cube_detect256multiply256.mat');
value=miu.miu(ind);                                     % return on element of variable miu inside the matfile object

Answer 1

[Rishik Ramena]

Yeah, you are intending to address the object itself and not the Properties of the object.

value = miu.miu(ind);

This should be what you wanted to do. For more information on MAT files and their usage, check out this example here.