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

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?

Answer 1

[Steven Lord]

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))

[Alexandra Philip]

How should I modify the equation since most of the values are extracted from data?

[Steven Lord]

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]

Here is the attached file for BIA_COF_0

[Alexandra Philip]

Attached is the correct file BIA0