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# Undefined function 'mtimes' for input arguments of type 'cell'.

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Alexandra Philip on 14 Jul 2020
Commented: Alexandra Philip on 14 Jul 2020
I am having some trouble with obtaining a calculation. I first used:
radians=0;
Rs=1.00021697;
dRs=250;
SeattleG=32.17546;
GNOG=32.12536;
VSFR=cos(radians)*((ATretreive{1,3} - (ATretreive{1,5}))/(2*Rs)); %Vertical readings-scale factor
VBR=((ATretreive{1,3} + ATretreive{1,5})/(2*VSFR))*1000000; %Vertical readings-bias
VRTemp=(((ATretreive{1,7} + (ATretreive{1,8}) + (ATretreive{1,9}) + (ATretreive{1,10}))/4) *100)-273; %Vertical readings-temp
HBR=((ATretreive{1,4} + ATretreive{1,6})/(2*VSFR))*1000000; %Horizontal readings-bias
rmdData=importdata('AccelQuery.mat')
SERIAL_NUMBER={rmdData.('SERIAL_NUMBER')}
BIA_COF_0={rmdData.('BIA_COF_0')}
BIA_COF_1={rmdData.('BIA_COF_1')}
BIA_COF_2={rmdData.('BIA_COF_2')}
BIA_COF_3={rmdData.('BIA_COF_3')}
BIA_COF_4={rmdData.('BIA_COF_4')}
SF_COF_0={rmdData.('SF_COF_0')}
SF_COF_1={rmdData.('SF_COF_1')}
SF_COF_2={rmdData.('SF_COF_2')}
SF_COF_3={rmdData.('SF_COF_3')}
SF_COF_4={rmdData.('SF_COF_4')}
mergetables=table(SERIAL_NUMBER,BIA_COF_0,BIA_COF_1,BIA_COF_2,BIA_COF_3...
,BIA_COF_4,SF_COF_0,SF_COF_1,SF_COF_2,SF_COF_3,SF_COF_4);
uitdata=uitable(uifigure,'Data',mergetables);
uitdata.ColumnName={'Accel S/N' ;'BIA_COF_0'; 'BIA_COF_1'; 'BIA_COF_2'; 'BIA_COF_3' ;'BIA_COF_4';...
'SF_COF_0'; 'SF_COF_1'; 'SF_COF_2' ;'SF_COF_3' ;'SF_COF_4'};
BIA0=mergetables{app.AccelSNEditField == mergetables{:,1},2};
BIA1=mergetables{app.AccelSNEditField == mergetables{:,1},3};
BIA2=mergetables{app.AccelSNEditField == mergetables{:,1},4};
BIA3=mergetables{app.AccelSNEditField == mergetables{:,1},5};
BIA4=mergetables{app.AccelSNEditField == mergetables{:,1},6};
SF0=mergetables{app.AccelSNEditField == mergetables{:,1},7};
SF1=mergetables{app.AccelSNEditField == mergetables{:,1},8};
SF2=mergetables{app.AccelSNEditField == mergetables{:,1},9};
SF3=mergetables{app.AccelSNEditField == mergetables{:,1},10};
SF4=mergetables{app.AccelSNEditField == mergetables{:,1},11};
CalcBias=(BIA0+(BIA1*(VRTemp-20))+(BIA2*(VRTemp-20)^2)+(BIA3*(VRTemp-20)^3)+...
(BIA4*(VRTemp-20)^4))*(SeattleG/GNOG); %Calculated Bias
Then I get an error for CalcBias:
Undefined function 'mtimes' for input arguments of type 'cell'.
Any suggestions or resolutions?

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### Answers (1)

Steven Lord on 14 Jul 2020
Matrix multiplication isn't defined for a cell array. No arithmetic operators are. Unlike a double or single precision matrix, the elements in a cell array don't have to contain just numbers. They don't have to be scalars.
C = {'abcde', ones(2, 3, 4), magic(5); {'q'}, struct('abc', 'def'), []}
You can't multiply C by anything or anything by C.
A = C*[1 2; 3 4] % Throws an error
You can't multiply C(1, 3) by anything or anything by C(1, 3). C(1, 3) is itself a cell.
B = C(1, 3)*fliplr(eye(5)) % Throws an error
You can multiply C{1, 3} (which is a 5-by-5 matrix) by something with which it's compatible.
D = C{1,3}*fliplr(eye(5))

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Steven Lord on 14 Jul 2020
I assume the BIA* variables are cell arrays. You probably want to extract the data inside the cell like I did in the line that assigns to D in my example.
If they aren't a simple cell array show us their structure.
celldisp(BIA0) % Assuming this isn't too long
or save one of them in a MAT-file and attach it to a comment.
Alexandra Philip on 14 Jul 2020
Here is the attached file for BIA_COF_0
Alexandra Philip on 14 Jul 2020
Attached is the correct file BIA0

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