Error loading a matrix

Hi,

I have a saved bidimensional array on a .m file called pauta.m:

lab = [523.251 0.125;...
       523.251 0.0625;...
       659.255 0.0625;...
       523.251 0.0625;...
       493.88 0.5;...
       440.00 2;...
       392.00 1];

When I want to use it on the main script, MatLab returns this error:

"Attempt to execute SCRIPT pauta as a function: directory\pauta.m

Error in MiniProj (line 6) for n = 1:length(pauta)"

This is the main script:

Fs = 44100;

    all_notes = [];
    for n = 1:length(pauta)
        x = signal_1(Fs,pauta(n,1),pauta(n,2));
        %plot(x);
        all_notes = [all_notes x];

    end 

    sound(all_notes,Fs)

Any thoughts? Thank you in advance.

Best regards, Sérgio Pereira.

Answer 1

[per isakson]

I think you should convert pauta to a function

    function  val = pauta( rr, cc )

        lab = [523.251 0.125
               523.251 0.0625
               659.255 0.0625
               523.251 0.0625
               493.88  0.5
               440.00  2
               392.00  1    ];

       val = lab( rr, cc );
    end

(error checking and efficiency set aside)

&nbsp

... or, but I hesitate to show it. (I think it smells.)

Create a script, pauta_script.m, which reads

    pauta = [  523.251 0.125
               523.251 0.0625
               659.255 0.0625
               523.251 0.0625
               493.88  0.5
               440.00  2
               392.00  1    ];

and modify the main script to read

    Fs = 44100;
    pauta_script;
    all_notes = nan( 1, length( pauta ) );
    for n = 1:length(pauta)
        x = signal_1(Fs,pauta(n,1),pauta(n,2));
        %plot(x);
        all_notes( 1, n ) = x;
    end 
    sound(all_notes,Fs)

Here I pre-allocated all_notes to the correct length. I use nan beause I guess signal_1 should not return nan and it is thus easy to check whether all element have been assigned values signal_1.