Taking a string input and transferring it to a integer

I am trying to write a script to calculate the nominal kohms of a resistor. I need to create a menu of 10 colors and be able to assign those colors a number that I can use to create the final equasion. The numbers are integers ranging from 0 to 9 and there are three user selected inputs. Thanks in advance!

[DGM]

If you really insist on doing this with dialogs, you can use listdlg.

https://www.mathworks.com/help/matlab/ref/listdlg.html

Otherwise, build a uifigure or something

Answer 1

[DGM]

Meh.

numbands = 4;

colornames = {'black','brown','red','orange','yellow','green','blue','violet','gray','white','gold','silver'};
tolerancemap = [1 2 0.5 0.25 0.1 0.05 5 1]; % in percent
multmap = [0:7 -1 -2];

digits = zeros(1,numbands-2);
for vb = 1:numbands
    ps = sprintf('Color Band %d',vb);
    if vb == numbands
        %tol = listdlg('promptstring',ps,'selectionmode','single','liststring',colornames([2 3 6:9 11 12]));
        tol = menu(ps,colornames([2 3 6:9 11 12]));
    elseif vb == numbands-1
        %multiplier = listdlg('promptstring',ps,'selectionmode','single','liststring',colornames([1:8 11 12]));
        multiplier = menu(ps,colornames([1:8 11 12]));
    else
        %digits(vb) = listdlg('promptstring',ps,'selectionmode','single','liststring',colornames);
        digits(vb) = menu(ps,colornames);
    end
end

value = str2double(sprintf('%d',digits-1)) * 10^multmap(multiplier);
tol = tolerancemap(tol);

if value >= 1E6
    fprintf('The resistor value is %.2f Mohms, with a tolerance of %.2f%%\n',value/1E6,tol)
elseif value >= 1E3
    fprintf('The resistor value is %.2f kohms, with a tolerance of %.2f%%\n',value/1E3,tol)
else
    fprintf('The resistor value is %.2f ohms, with a tolerance of %.2f%%\n',value,tol)
end

Now you can add the tempco band too.

[Jacob Belouin]

Thanks for the answer!

I am a first time matlab user, I can understand a lot of these commands but i'm a little hung up on the first for statement and what that is actually doing. Specifically the zeros command and the elipsis in the listdlg commands.

thanks

[DGM]

Here, zeros() is used to preallocate a vector to hold the significant digits of the value. I'm assuming the color code scheme uses one band for tolerance and one band for a value multiplier; hence, the length of this vector is 2 less than the number of color bands.

The ellipsis is just a way to break long expressions across multiple lines so that the parser knows it's all one line of code.

[Jacob Belouin]

Thanks again, huge help.

[Jacob Belouin]

Understanding how you approached this now, its a way more efficent method but my Professor is telling me it has to use the menu command rather than listdlg. I dont need the whole answer, but is there a way to index arrays within the menu command?

[DGM]

Augh. I didn't even think about literally using menu(). I never use interactive stuff, so i don't remember any of these things.

I edited to add example usage of menu in place of listdlg(). The indexing is basically the same.