Error in Using interp1

Hello everyone i have an array named 'x' and trying to interpolate it but i am getting an error as "Interpolation requires at least two sample points in each dimension." Here is my code;

 x_1 = interp1(0:duration*44100,X,0:1:duration*44100,'linear');

I need to resize x array to (duration * 44100). Any help would be great. Thanks.

[Geoff Hayes]

ugurcan - what can you tell us about duration and X? It would be interesting to know what duration is so that we can determine the range of

 0:duration*44100

and how many elements are in X.

[ugurcan sahin]

duration is an input which is max 10, for x it is better to show my code

function generate_sound(sigma, rho, beta, vector, duration)

[duration,newvector] = ode45(@lor2,[0,10*duration],vector);

x_0 = newvector(:,1);

y_0 = newvector(:,2);

z_0 = newvector(:,3);

      function empty = lor2(duration,vector) 

      empty = zeros(3,1); 

      empty(1) = -sigma*vector(1) + sigma*vector(2); 

      empty(2) = rho*vector(1) - vector(2) - vector(1)*vector(3); 

      empty(3) = -beta*vector(3) + vector(1)*vector(2);

      end 

X = x_0;

Answer 1

[Walter Roberson]

That code does not show an interp1 ?

If the duration being interpolated over is the output of the ode45 call, then note that it is a vector, not a scalar.

Your X is going to be a column vector: it could make a difference to interp1 to transpose it to be a row vector.

Answer 2

[Image Analyst]

You vectors are wrong, especially the first arg to interp1(). This works:

duration = 2;
X = audioread('guitartune.wav'); % Read sample data.
% Define how you want to resample it
resamplingVector = 1 : (duration * 44100);
% Now to the interpolation.
x_1 = interp1(1:length(X), X, resamplingVector,'linear');