Error: "Cell contents assignment to a non-cell array object."

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Holly Pothier
Holly Pothier 2018-7-30
编辑： Holly Pothier 2018-7-30
Hello,
I am getting the error "Cell contents assignment to a non-cell array object" on a single line which is attempting to assign a variable into a previously created cellarray. The code does this many times, however, it is only getting stuck at this one and I can't figure out why. I have checked the brackets used and some other tips I found in the forum.
Thanks for the help. The code is below. The error is on line 135 (Glx_AlphaTissCorr{count} = Glx_AlphaTissCorr;)
source_path = 'B:\BBA\Gannet\Tests\Test_batchAllSteps\Test_batchWithWater_7.26.18\GannetQuantify_output'; %where we are pulling data (.mat files) from
final_path = 'B:\BBA\Gannet\Tests\Test_batchAllSteps\Test_batchWithWater_7.26.18\GannetQuantify_output'; %where to output excel file
keyword = 'MRS_struct';
%need to declare variables/arrays as zero so we can add to them in loops
cd(source_path)
%%Make empty arrays with N_max, 1 dimension to hold N data.
%1, N_max is row, N_max,1 is column
N_max = 100;
count = 0;
MAT_filename_cellarray = cell(N_max,1);
%Empty cell arrays here that we will fill later
%Data input in comment to right of empty array line below
%GABA cell arrays
GABACr_cellarray = cell(N_max,1); %from output: ConcCr
GABAIU_cellarray = cell(N_max,1);%from output: ConcIU
GABAFitError_cellarray = cell(N_max,1);%from output: FitError
GABA_CSFCorr_cellarray = cell(N_max, 1);%from output: ConcIU_CSFCorr
GABA_TissCorr_cellarray = cell(N_max, 1);%from output: ConcIU_TissCorr
GABA_AlphaTissCorr_cellarray = cell(N_max, 1); %from output: ConcIU_AlphaTissCorr
GABA_AlphaTissCorr_GrpNorm_cellarray = cell(N_max, 1); %from output: ConcIU_AlphaTissCorr_GrpNorm
%Glx cell arrays
GlxCr_cellarray = cell(N_max,1); %from output: ConcCr
GlxIU_cellarray = cell(N_max,1); %from output: ConcIU
GlxFitError_cellarray = cell(N_max,1); %from output: FitError
Glx_CSFCorr_cellarray = cell(N_max, 1); %from output: ConcIU_CSFCorr
Glx_TissCorr_cellarray = cell(N_max, 1); %from output: ConcIU_TissCorr
Glx_AlphaTissCorr_cellarray = cell(N_max, 1); %from output: ConcIU_AlphaTissCorr
Glx_AlphaTissCorr_GrpNorm_cellarray = cell(N_max, 1); %from output: ConcIU_AlphaTissCorr_GrpNorm
%Tissue composition cell arrays
GMFra_cellarray = cell(N_max, 1); %from output: GMfra
WMFra_cellarray = cell(N_max, 1); %from output: WMfra
CSFfra_cellarray = cell(N_max, 1); %from output: CSFfra
%output_xls_filename = 'Gannet_MAT_Output';
%%Read Data + set variables to load into arrays / export at end
display (' look for MAT files in Quantify folder');
MAT_file_location = dir([source_path, '/*.mat']);%list all conent from location of MAT files
for i = 1: length(MAT_file_location);
%%%Suggestion from forum. Can use instead of strfind
% F = sprintf('*%s*.mat', keyword);
% S = dir(fullfile(source_path, F));
% for k = 1:numel(S)
% tmp_ = load(fullfile(F,S(k).name));
if(strfind(MAT_file_location(i).name, keyword)); %if file has MRS_struct in name
%load mat files to array- loading file we found at top of loop with
%keyword etc
tmp = load(MAT_file_location(i).name); % getting the name and ext. of file "MRS_struct.mat"
% tmp is now MRS_struct file
count = count + 1;
display ('Look for data from MRS_struct');
%dont put these values in '' or it will be string, this gives data
display ('Getting GABA data from MRS_struct');
%GABA Data from MRS_struct-- here we are getting values from MRS
%struct and assigning to variables
GABACr = tmp.MRS_struct.out.vox1.GABA.ConcCr(i);
GABAIU = tmp.MRS_struct.out.vox1.GABA.ConcIU(i);
GABAFitError = tmp.MRS_struct.out.vox1.GABA.FitError(i);
GABA_CSFcorr = tmp.MRS_struct.out.vox1.GABA.ConcIU_CSFcorr(i);
GABA_TissCorr = tmp.MRS_struct.out.vox1.GABA.ConcIU_TissCorr(i);
GABA_AlphaTissCorr = tmp.MRS_struct.out.vox1.GABA.ConcIU_AlphaTissCorr(i);
GABA_AlphaTissCorr_GrpNorm = tmp.MRS_struct.out.vox1.GABA.ConcIU_AlphaTissCorr_GrpNorm(i);
display ('Getting Glx data from MRS_struct');
%Glx Data from MRS_struct
GlxCr = tmp.MRS_struct.out.vox1.Glx.ConcCr(i);
GlxIU = tmp.MRS_struct.out.vox1.Glx.ConcIU(i);
GlxFitError = tmp.MRS_struct.out.vox1.Glx.FitError(i);
GlxIU_CSFcorr = tmp.MRS_struct.out.vox1.Glx.ConcIU_CSFcorr(i);
Glx_TissCorr = tmp.MRS_struct.out.vox1.Glx.ConcIU_TissCorr(i);
Glx_AlphaTissCorr = tmp.MRS_struct.out.vox1.Glx.ConcIU_AlphaTissCorr(i);
Glx_AlphaTissCorr_GrpNorm = tmp.MRS_struct.out.vox1.Glx.ConcIU_AlphaTissCorr_GrpNorm(i);
display ('Getting Tissue data from MRS_struct');
%Tissue Concentration Data from MRS_struct
GMFra = tmp.MRS_struct.out.vox1.tissue.GMfra(i);
WMFra = tmp.MRS_struct.out.vox1.tissue.WMfra(i);
CSFfra = tmp.MRS_struct.out.vox1.tissue.CSFfra(i);
%Here we are assigning above data to empty arrays created earlier
%We will then export them below
display ('Assigning data to arrays');
%Loading GABA variables/data into arrays
MAT_filename_cellarray{count} = MAT_file_location(i).name;
GABACr_cellarray{count} = GABACr;
GABAIU_cellarray{count} = GABAIU;
GABAFitError_cellarray{count} = GABAFitError;
GABA_CSFCorr_cellarray{count} = GABA_CSFcorr;
GABA_TissCorr_cellarray{count} = GABA_TissCorr;
GABA_AlphaTissCorr_cellarray{count} = GABA_AlphaTissCorr;
GABA_AlphaTissCorr_GrpNorm_cellarray{count} = GABA_AlphaTissCorr_GrpNorm;
%Loading Glx variables/data into arrays
GlxCr_cellarray{count} = GlxCr;
GlxIU_cellarray{count} = GlxIU;
GlxFitError_cellarray{count} = GlxFitError;
GlxIU_cellarray {count} = GlxIU;
GlxFitError_cellarray{count} = GlxFitError;
Glx_CSFCorr_cellarray{count} = GlxIU_CSFcorr;
Glx_TissCorr_cellarray{count} = Glx_TissCorr;
Glx_AlphaTissCorr{count} = Glx_AlphaTissCorr;
Glx_AlphaTissCorr_GrpNorm_cellarray{count} = Glx_AlphaTissCorr_GrpNorm;
display ('tissue conc');
%Loading Tissue Conc variables/data into arrays
GMFra_cellarray{count} = GMFra;
WMFra_cellarray{count} = WMFra;
CSFfra_cellarray{count} = CSFfra;
count = count + 1;
end
end
%array of headers, values-- MAKE SURE THESE ARE IN THE SAME ORDER
%put these 2 into an outputcell and write to excel
display ('Getting ready to output')
output_header_cellarray = ... %Headers for output document
[{'PID'},{'GABAConcCr'}, {'GABAConcIU'}, {'GABAFitError'}, {'GABA_CSFCorr'}, {'GABA_TissCorr'}, {'GABA_AlphaTissCorr'} , {'GABA_AlphaTissCorr_GrpNorm'} , {'GlxConcCr'} , {'GlxConcIU'} , {'GlxFitError'} , {'Glx_CSFCorr'} , {'Glx_TissCorr'} , {'Glx_AlphaTissCorr'} , {'Glx_AlphaTissCorr_GrpNorm'} ];
output_value_cellarray = ...%Data that goes into each column
[MAT_filename_cellarray,GABACr_cellarray, GABAIU_cellarray, GABAFitError_cellarray, GABA_CSFCorr_cellarray, GABA_TissCorr_cellarray, GABA_AlphaTissCorr_cellarray, GABA_AlphaTissCorr_GrpNorm_cellarray , GlxCr_cellarray , GlxIU_cellarray , GlxFitError_cellarray, Glx_CSFCorr_cellarray , Glx_TissCorr_cellarray , Glx_AlphaTissCorr_cellarray , Glx_AlphaTissCorr_GrpNorm_cellarray];
output_cell = [output_header_cellarray; output_value_cellarray]; %write header + value cellarrays
output_xls_filename = 'Gannet_Quantify_Extract';
xlswrite(output_xls_filename, output_cell);
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Walter Roberson
Walter Roberson 2018-7-30
Glx_AlphaTissCorr{count} = Glx_AlphaTissCorr
Notice that you are assigning to the same variable as you are reading from and you are asking to store the entire variable to a part of the variable. That typically only makes sense in certain linked list type procedures.

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采纳的回答

Guillaume
Guillaume 2018-7-30
Error on
Glx_AlphaTissCorr{count} = Glx_AlphaTissCorr
Well, the error is clear, Glx_AlphaTissCorr is not a cell array.
Even if it were, the line makes no sense as it tries to assign a variable as a member of itself. Considering that all your cell arrays are named xxx_cellarray, the left hand side is suspicious. And considering that on the previous line, you've already assigned Glx_AlphaTissCorr to its corresponding cell array, I suspect that the fix is to simply remove the offending line.

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