MATLAB: How to solve This Equation

polynomial

I all, I have to solve thise equation VFA=408.5 +25.4 pH + 33.9 COD/N -1.8 pH x COD/N +1.8 pH2 -0.3 COD/N2

where pH is a column vector and COD/N is a row vector (10000 numbers).

the result should be a matrix…

Thanks for the help!!

Best Answer

Use ndgrid() or meshgrid() and vectorize your expressions. You will need to figure out what pH2 and N2 are, though.

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MATLAB: How to load multiple files and do the computation for each of them and write the output in consequent rows

Your loop will want to start with grabbing all files in a folder. uigetfile with the MultiSelect option will work wonders here:

[Name,Path]=uigetfile({'*.xlsx*'},'MultiSelect','on');
entirefile=fullfile(Paths,Names);

Then start your loop. It wants to run a number of times equal to the number of elements in your entirefile cell, as you also have in your own code. Within this loop, do all your loading, calculation and writing. To avoid cluttering the workspace, you might want to look into a structure and dot indexing.

for i=1:numel(entirefile);
    %your entire code including
    enginedata(i).raw=importdata(entirefile{i});
    enginedata(i).temperature = your temperature calculation
    enginedata(i).oilpressure = oil pressure calculation
    %and so on
    %finally, to write in consecutive fields the results, simply keep indexing your things:
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    writecell(mean_engine_temperature,filename,'Sheet','Temperatures','Range',celltarget);
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MATLAB: Need help with the function (Basic Question)

Step1: I think it would be better to replace your commas with && like so:

if 0 <= pH && ph < 7
  % code
end

To make code function, we would then place the messages within the if statements like so:

if 0 <= pH && ph < 7
  message = 'acidic';
end

Lastly, it is better form to you if-elseif-else in this situation:

if 0<= pH && pH < 7
  message = "acidic";   
elseif pH == 7
  message = "neutral";
elseif pH > 7 && pH <= 14
  message = "basic";
else
  message = "Not valid pH";
  pH=0;
end

Hope this helps you understand.

Best Answer

Related Solutions

MATLAB: How to load multiple files and do the computation for each of them and write the output in consequent rows

MATLAB: Need help with the function (Basic Question)

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