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POModify an Excel sheet from Matlab
 

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    <p>Is it possible to open a worksheet in excel from matlab and edit the formulas? The idea is to automate an uncertainty analysis by creating a second sheet with the uncertainty in each cell for the value from the previous cell. Essentially, I want to treat the cells as variables and do SQRT(SUM(Partials(xi)^2)) for each cell. Matlab should have no problem with the calc, but can it edit the formulas in sheets?</p> <p>The process currently is to copy and paste from excel to matlab. Here's a small function that does the uncertainty in matlab against on array of equations:</p> <pre><code>function [f_u_total f_u] = uncertAnalysis(f, vars, vars_u) f_u = []; f_u_total = []; for(i=1:length(f)) f(i) item = uncertAnalysisi(f(i), vars, vars_u); f_u = [f_u; item(1)]; f_u_total = [f_u_total; item(1)]; end end function [f_u_total f_u] = uncertAnalysisi(f, vars, vars_u) f_u = []; % take the partials and square them for i=1:length(vars) f_u = [f_u; vars(i) (diff(f, vars(i)).*vars_u(i)).^2]; end % calculate the RSS f_u_total = (sum(f_u(:,2))).^.5; end </code></pre> <p>As an aside, the equations look something like this (why I'm not doing this by hand):</p> <pre><code>=(9*C!S3^2/C!V3^4*C!W3*(C!O3- C!P3)/C!X3*C!Q3^6*C!F3^4/C!Y3^6/(C!U3^C!Z3)^6*F3^2+1/4*C!S3^2/C!V3^4*C!W3/(C!O3- C!P3)/C!X3*C!Q3^6*C!F3^6/C!Y3^6/(C!U3^C!Z3)^6*O3^2+1/4*C!S3^2/C!V3^4*C!W3/(C!O3- C!P3)/C!X3*C!Q3^6*C!F3^6/C!Y3^6/(C!U3^C!Z3)^6*P3^2+9*C!S3^2/C!V3^4*C!W3*(C!O3- C!P3)/C!X3*C!Q3^4*C!F3^6/C!Y3^6/(C!U3^C!Z3)^6*Q3^2+1/C!V3^4*C!W3*(C!O3- C!P3)/C!X3*C!Q3^6*C!F3^6/C!Y3^6/(C!U3^C!Z3)^6*S3^2+9*C!S3^2/C!V3^4*C!W3*(C!O3- C!P3)/C!X3*C!Q3^6*C!F3^6/C!Y3^6/(C!U3^C!Z3)^6*C!Z3^2/C!U3^2*U3^2+4*C!S3^2/C!V3^6*C!W3*(C!O 3-C!P3)/C!X3*C!Q3^6*C!F3^6/C!Y3^6/(C!U3^C!Z3)^6*V3^2+1/4*C!S3^2/C!V3^4/C!W3*(C!O3- C!P3)/C!X3*C!Q3^6*C!F3^6/C!Y3^6/(C!U3^C!Z3)^6*W3^2+1/4*C!S3^2/C!V3^4*C!W3*(C!O3- C!P3)/C!X3^3*C!Q3^6*C!F3^6/C!Y3^6/(C!U3^C!Z3)^6*X3^2+9*C!S3^2/C!V3^4*C!W3*(C!O3- C!P3)/C!X3*C!Q3^6*C!F3^6/C!Y3^8/(C!U3^C!Z3)^6*Y3^2+9*C!S3^2/C!V3^4*C!W3*(C!O3- C!P3)/C!X3*C!Q3^6*C!F3^6/C!Y3^6/(C!U3^C!Z3)^6*LOG(C!U3)^2*Z3^2)^(1/2) </code></pre>
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    1. COI have to ask, why are you using Excel for this at all? It's not really intended for scientific data analysis like this. You might be better off exporting the data to text files, importing into MATLAB, calculating your results, then saving as text and importing back into Excel.
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    2. CODavid, its the 'standard' in our lab (mechanical engineering lab). I agree, and like to keep things purely in matlab if I can. I must say though, excel does have its merits. For example having the sheet 'programmed' while you take data provides for some nice real-time calculations/visualizations.
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