error in code for pitch tracking

i am using matlab 7.1 version. following code for "pitch track" of audio signal is downloaded

from link "http://labrosa.ee.columbia.edu/projects/pitchflow/". i am getting error at logfsgram()

 saying that " Undefined function 'logfsgram' for input arguments of type 'double'.

Error in demo_pitchflow (line 26) logfsgram(d,256,sr); " how can i solve it?please help. code is as below..

% Load a sound file

[d,sr] = audioread(['/u/drspeech/data/swordfish/code/ehist/' ... 'BABEL_OP1_206_65882_20121201_174526_outLine.sph']);

% Plot its log-frequency spectrogram

subplot(311)

logfsgram(d,256,sr);

caxis([-30 30]);

% Calculate the normalized cross-correlation of adjacent log-f spectra

sxc = pitchflow(d, sr);

subplot(312)

tt = [0:(size(sxc,2)-1)]*0.010;

rr = [1:size(sxc,1)] - (size(sxc, 1)+1)/2; imagesc(tt, rr, sxc); axis('xy'); grid

% Collapse each excerpt from the cross-corrletions into 3 features,

% the first three moments of the exponentiated NCC

dpf = pitchflow_collapse(sxc);

subplot(313)

plot(tt, dpf);

% Overplot the first moment on the xcorr, to show it tracks the main peak

subplot(312)

hold on;

plot(tt, dpf(2,:), '-w');

hold off

% Line up and zoom in

linkaxes([subplot(311),subplot(312),subplot(313)], 'x')

axis([196 200 -5 10])