MATLAB: Using the listdlg index to select an array

listdlg

Hi,
I'm a beginner at using laptop and I've hit problem with using the index value given out of the listdlg function to select an array.
I've been racking my brain how to do this, but I obviously haven't managed to get the syntax right.
Im aware it could probably be done using 'if statements,' but due to the intentions of the projects it seems a bit of a long-winded way to go about it.
Anyway, any help with this would be so greatly appreciated.
Thanks.
The code ive used so far:
MATW = {'Curtain','Glass','Plaster','Plasterboard','Wood','Acoutic Treatment'};
MATF = {'Concrete or Tile','Carpet On Foam'};
MatNumb = [1,2,3,4,5,6 ];
MatNumb(1) = [0.14 0.35 0.55 0.72 0.70 0.65];
MatNumb(2) = [0.35, 0.25, 0.18, 0.12, 0.07, 0.04];
MatNumb(3) = [0.013, 0.015, 0.02, 0.03, 0.04, 0.05];
MatNumb(4) = [0.29, 0.10, 0.05, 0.04, 0.07, 0.09];
MatNumb(5) = [0.28, 0.22, 0.17, 0.09, 0.10, 0.11];
MatNumb(6) = [0.05, 0.22, 0.52, 0.56, 0.45, 0.32];
ConcreteT = [0.01, 0.01, 0.015, 0.02, 0.02, 0.02];
CarpetF = [0.08, 0.24, 0.57, 0.69, 0.71, 0.73];
Backwall = 'Please state the area (m2) for the back wall: ';
BWA = input(Backwall);
[BWM] = listdlg('PromptString','Select Backwall Material:',...
                'SelectionMode','single',...
                'ListString',MATW);
BWA*MatNumb(BWM)
end

Best Answer

Your approach is correct, and produces efficient code.
You need to supply a second dimension to ‘MatNumb’, then make the appropriate changes in other parts of your code.
This runs without error. I have no idea what you are doing, so I defer to you for the rest.
The (Revised) Code —
MATW = {'Curtain','Glass','Plaster','Plasterboard','Wood','Acoustic Treatment'};
MATF = {'Concrete or Tile','Carpet On Foam'};
MatNumbIdx = [1,2,3,4,5,6];
MatNumb(1,:) = [0.14 0.35 0.55 0.72 0.70 0.65];
MatNumb(2,:) = [0.35, 0.25, 0.18, 0.12, 0.07, 0.04];
MatNumb(3,:) = [0.013, 0.015, 0.02, 0.03, 0.04, 0.05];
MatNumb(4,:) = [0.29, 0.10, 0.05, 0.04, 0.07, 0.09];
MatNumb(5,:) = [0.28, 0.22, 0.17, 0.09, 0.10, 0.11];
MatNumb(6,:) = [0.05, 0.22, 0.52, 0.56, 0.45, 0.32];
ConcreteT = [0.01, 0.01, 0.015, 0.02, 0.02, 0.02];
CarpetF = [0.08, 0.24, 0.57, 0.69, 0.71, 0.73];
Backwall = 'Please state the area (m2) for the back wall: ';
BWA = inputdlg(Backwall);
BWA = str2num(BWA{:});
[BWM] = listdlg('PromptString','Select Backwall Material:',...
                'SelectionMode','single',...
                'ListString',MATW);
Result = BWA*MatNumb(BWM,:)
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