Matlab load() command error when loading a saved cell from a .mat file

Hello, System: Matlab version: R2013a (8.1.0.604), 64-bit on windows 7 My problem: I have created a cell variable idx1 using a rangesearch function:

idx1 = rangesearch(b_values_50,2.1897,0.001);

b_values is a vector of type double. Then I save the cell to a .mat file:

save('idx1_index.mat','idx1') or 
save('idx1_index.mat','idx1','-v7.3') or 
save('idx1_index.mat','idx1','-v7')

I have attached this file below. Then I try to load it:

load('idx1_index.mat','-mat') or 
load('idx1_index.mat') or 
load('idx1_index')

And I get this popup:

And I get all these errors (below). Please comment with any solutions. Thanks Exception occurred during event dispatching:

java.lang.ClassCastException: [D cannot be cast to [Z
  at com.mathworks.mlwidgets.array.ValuePanel$ROML.matlabEvent(ValuePanel.java:224)
  at com.mathworks.jmi.MatlabMCR$AWTReplyEvent.run(MatlabMCR.java:1675)
  at java.awt.event.InvocationEvent.dispatch(Unknown Source)
  at java.awt.EventQueue.dispatchEvent(Unknown Source)
  at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
  at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
  at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
  at java.awt.Dialog$1.run(Unknown Source)
  at java.awt.Dialog$3.run(Unknown Source)
  at java.security.AccessController.doPrivileged(Native Method)
  at java.awt.Dialog.show(Unknown Source)
  at com.mathworks.mwswing.MJDialog.show(MJDialog.java:311)
  at java.awt.Component.show(Unknown Source)
  at java.awt.Component.setVisible(Unknown Source)
  at java.awt.Window.setVisible(Unknown Source)
  at java.awt.Dialog.setVisible(Unknown Source)
  at com.mathworks.mwswing.MJOptionPane.showOptionDialog(MJOptionPane.java:531)
  at com.mathworks.mwswing.MJOptionPane.showMessageDialog(MJOptionPane.java:436)
  at com.mathworks.mwswing.MJOptionPane.showMessageDialog(MJOptionPane.java:426)
  at com.mathworks.mlwidgets.array.ArrayDialog$1.run(ArrayDialog.java:48)
  at java.awt.event.InvocationEvent.dispatch(Unknown Source)
  at java.awt.EventQueue.dispatchEvent(Unknown Source)
  at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
  at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
  at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
  at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
  at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
  at java.awt.EventDispatchThread.run(Unknown Source)
Exception occurred during event dispatching:
java.lang.ClassCastException: [D cannot be cast to [Z
  at com.mathworks.mlwidgets.array.ValuePanel$ROML.matlabEvent(ValuePanel.java:224)
  at com.mathworks.jmi.MatlabMCR$AWTReplyEvent.run(MatlabMCR.java:1675)
  at java.awt.event.InvocationEvent.dispatch(Unknown Source)
  at java.awt.EventQueue.dispatchEvent(Unknown Source)
  at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
  at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
  at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
  at java.awt.Dialog$1.run(Unknown Source)
  at java.awt.Dialog$3.run(Unknown Source)
  at java.security.AccessController.doPrivileged(Native Method)
  at java.awt.Dialog.show(Unknown Source)
  at com.mathworks.mwswing.MJDialog.show(MJDialog.java:311)
  at java.awt.Component.show(Unknown Source)
  at java.awt.Component.setVisible(Unknown Source)
  at java.awt.Window.setVisible(Unknown Source)
  at java.awt.Dialog.setVisible(Unknown Source)
  at com.mathworks.mwswing.MJOptionPane.showOptionDialog(MJOptionPane.java:531)
  at com.mathworks.mwswing.MJOptionPane.showMessageDialog(MJOptionPane.java:436)
  at com.mathworks.mwswing.MJOptionPane.showMessageDialog(MJOptionPane.java:426)
  at com.mathworks.mlwidgets.array.ArrayDialog$1.run(ArrayDialog.java:48)
  at java.awt.event.InvocationEvent.dispatch(Unknown Source)
  at java.awt.EventQueue.dispatchEvent(Unknown Source)
  at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
  at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
  at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
  at java.awt.Dialog$1.run(Unknown Source)
  at java.awt.Dialog$3.run(Unknown Source)
  at java.security.AccessController.doPrivileged(Native Method)
  at java.awt.Dialog.show(Unknown Source)
  at com.mathworks.mwswing.MJDialog.show(MJDialog.java:311)
  at java.awt.Component.show(Unknown Source)
  at java.awt.Component.setVisible(Unknown Source)
  at java.awt.Window.setVisible(Unknown Source)
  at java.awt.Dialog.setVisible(Unknown Source)
  at com.mathworks.mwswing.MJOptionPane.showOptionDialog(MJOptionPane.java:531)
  at com.mathworks.mwswing.MJOptionPane.showMessageDialog(MJOptionPane.java:436)
  at com.mathworks.mwswing.MJOptionPane.showMessageDialog(MJOptionPane.java:426)
  at com.mathworks.mlwidgets.array.ArrayDialog$1.run(ArrayDialog.java:48)
  at java.awt.event.InvocationEvent.dispatch(Unknown Source)
  at java.awt.EventQueue.dispatchEvent(Unknown Source)
  at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
  at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
  at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
  at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
  at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
  at java.awt.EventDispatchThread.run(Unknown Source)
Exception occurred during event dispatching:
java.lang.ClassCastException: [D cannot be cast to [Z
  at com.mathworks.mlwidgets.array.ValuePanel$ROML.matlabEvent(ValuePanel.java:224)
  at com.mathworks.jmi.MatlabMCR$AWTReplyEvent.run(MatlabMCR.java:1675)
  at java.awt.event.InvocationEvent.dispatch(Unknown Source)
  at java.awt.EventQueue.dispatchEvent(Unknown Source)
  at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
  at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
  at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
  at java.awt.Dialog$1.run(Unknown Source)
  at java.awt.Dialog$3.run(Unknown Source)
  at java.security.AccessController.doPrivileged(Native Method)
  at java.awt.Dialog.show(Unknown Source)
  at com.mathworks.mwswing.MJDialog.show(MJDialog.java:311)
  at java.awt.Component.show(Unknown Source)
  at java.awt.Component.setVisible(Unknown Source)
  at java.awt.Window.setVisible(Unknown Source)
  at java.awt.Dialog.setVisible(Unknown Source)
  at com.mathworks.mwswing.MJOptionPane.showOptionDialog(MJOptionPane.java:531)
  at com.mathworks.mwswing.MJOptionPane.showMessageDialog(MJOptionPane.java:436)
  at com.mathworks.mwswing.MJOptionPane.showMessageDialog(MJOptionPane.java:426)
  at com.mathworks.mlwidgets.array.ArrayDialog$1.run(ArrayDialog.java:48)
  at java.awt.event.InvocationEvent.dispatch(Unknown Source)
  at java.awt.EventQueue.dispatchEvent(Unknown Source)
  at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
  at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
  at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
  at java.awt.Dialog$1.run(Unknown Source)
  at java.awt.Dialog$3.run(Unknown Source)
  at java.security.AccessController.doPrivileged(Native Method)
  at java.awt.Dialog.show(Unknown Source)
  at com.mathworks.mwswing.MJDialog.show(MJDialog.java:311)
  at java.awt.Component.show(Unknown Source)
  at java.awt.Component.setVisible(Unknown Source)
  at java.awt.Window.setVisible(Unknown Source)
  at java.awt.Dialog.setVisible(Unknown Source)
  at com.mathworks.mwswing.MJOptionPane.showOptionDialog(MJOptionPane.java:531)
  at com.mathworks.mwswing.MJOptionPane.showMessageDialog(MJOptionPane.java:436)
  at com.mathworks.mwswing.MJOptionPane.showMessageDialog(MJOptionPane.java:426)
  at com.mathworks.mlwidgets.array.ArrayDialog$1.run(ArrayDialog.java:48)
  at java.awt.event.InvocationEvent.dispatch(Unknown Source)
  at java.awt.EventQueue.dispatchEvent(Unknown Source)
  at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
  at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
  at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
  at java.awt.Dialog$1.run(Unknown Source)
  at java.awt.Dialog$3.run(Unknown Source)
  at java.security.AccessController.doPrivileged(Native Method)
  at java.awt.Dialog.show(Unknown Source)
  at com.mathworks.mwswing.MJDialog.show(MJDialog.java:311)
  at java.awt.Component.show(Unknown Source)
  at java.awt.Component.setVisible(Unknown Source)
  at java.awt.Window.setVisible(Unknown Source)
  at java.awt.Dialog.setVisible(Unknown Source)
  at com.mathworks.mwswing.MJOptionPane.showOptionDialog(MJOptionPane.java:531)
  at com.mathworks.mwswing.MJOptionPane.showMessageDialog(MJOptionPane.java:436)
  at com.mathworks.mwswing.MJOptionPane.showMessageDialog(MJOptionPane.java:426)
  at com.mathworks.mlwidgets.array.ArrayDialog$1.run(ArrayDialog.java:48)
  at java.awt.event.InvocationEvent.dispatch(Unknown Source)
  at java.awt.EventQueue.dispatchEvent(Unknown Source)
  at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
  at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
  at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
  at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
  at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
  at java.awt.EventDispatchThread.run(Unknown Source)

[Walter Roberson]

When I test your .mat on R2013a on OS-X El Capitan, or on R2016a on OS-X El Capitan, I have no difficulty.

I will need to check my virtual machines to see if I happen to have MATLAB installed in Windows... I think I might.

[Walter Roberson]

I installed R2013a on Windows 10 and tested, and had no problem with this file.

Answer 1

[Image Analyst]

This works fine for me

% See what's in the file before loading it
whos -file 'idx1_index.mat'
% Shows:
% Name      Size            Bytes  Class    Attributes
%  idx1      1x1               296  cell 
% OK, it's in there, so now load it in to a structure.
storedStructure = load('idx1_index.mat', 'idx1')
% Shows
% storedStructure = 
%    idx1: {[248 249 251 252 253 261 250 247 262 254 255 256 260 246 259 245 257 258 263 244 243 242 264]}
idx1Cell = storedStructure.idx1;
idx1DoubleArray = cell2mat(idx1Cell)

[Stepan Lavrinenko]

Thanks for the reply, Image Analyst,

I have also tried running the same command on an osx machine (Matlab R2015b), and I got this error: Error using cellstr (line 21) S must be 2-D.

Error in statslib.internal.getParamVal (line 38) inputs = cellstr(inputs);

Error in internal.stats.getParamVal (line 25) [selected,locs] = statslib.internal.getParamVal(inputs,kwds,argname,multok);

Error in createns (line 153) [~,i] = internal.stats.getParamVal(distMetric,distList,'Distance');

Error in rangesearch (line 128) O=createns(X,args{:},'nsmethod', nsmethod,'bucketSize',bSize);

Error in re_plot_d_window_50_in_md (line 205) idx1 = rangesearch(b_values_50,2.1897,0.001);

From what I could gather, this happened because for some reason 'kdtree' method option in rangesearch could not be used. When I used the 'exhaustive' option, it all worked fine. Not sure if this is somehow related to the original problem.

What is strange is that, I did not get an error loading in the idx1_index.mat file on the R2015b, but I did not get the "rangesearch" error listed above on R2013a. I would expect matlab to be more cross-compatible between different os's and versions.

I will try running the code you provided tomorrow on the windows machine.

[Stepan Lavrinenko]

Hello, Image Analyst, It seems like everything works fine on the windows machine (i.e. the loading is successful), but I still get the same error nonetheless. Both with your proposed routine and without it (using load('filename')). I am not sure if that has something to do with the machine I am working on or Matlab software version I am using. Thanks

[Image Analyst]

rangesearch takes 2 arrays as the first two arguments. That's not what you're passing in (I don't think) when you do

idx1 = rangesearch(b_values_50, 2.1897, 0.001);

The first array is okay, b_values_50, but for the second argument you have a number 2.1897 instead of an array with the same number of rows as b_values_50. Why is that?