Why am I receiving this error "Unrecognized function or variable '"plotspec" Error in lab2q2 (line 20) plotspec(xx,fs,256); grid on ?

amps = [100, 120];

freqs = [800,2000];

phases = [0.6*pi, -0.1*pi];

fs = 8000;

tStart = [0.1, 0.1];

durs = [0.4,0.4];

maxTime = max((sum(tStart) + sum(durs))) + 0.1; %-- Add time to show ...

% signal ending

durLengthEstimate = ceil(maxTime*fs);

tt = (0:durLengthEstimate)*(1/fs); %-- be conservative ...(add one)

xx = 0*tt; %--make a vector of zeros to hold the total ...signal

for kk = 1:length(amps)

nStart = round(fs .* tStart(kk))+1; %-- add one to avoid zero index

xNew = shortSinus(amps(kk), freqs(kk), phases(kk), fs, durs(kk));

Lnew = length(xNew);

nStop = Lnew + nStart - 1; %======== Add code

xx(nStart:nStop) = xx(nStart:nStop) + xNew;

end

plotspec(xx,fs,256); grid on

tt = (1/fs)*(0:length(xx)-1);

plot( tt, xx );

function xs = shortSinus(amp, freq, pha, fs, dur)

% amp = amplitude

% freq = frequency in cycle per second

% pha = phase, time offset for the first peak

% fs = number of sample values per second

% dur = duration in sec

%

tt = 0 : 1/fs : dur; % time indices for all the values

xs = amp * cos( freq*2*pi*tt + pha );

end

[Star Strider]

If the code is provided as a homework laboratory exercise, be certain you have downloaded all the functions relevant to it, and copied them to an appropriate directory on your MATLAB search path. The ‘plotspec’ function is likely one of them, and I assume that ‘shortSinus’ is also one of them.

Answer 1

[vamshi sai yele]

I have checked my resources and as far as my knowledge I could say that 'plotSpec' might not a function in any MATLAB toolbox.

I suggest you to make sure you don't miss any file loading into the root folder/directory before you run the script so that nothing miss from directory and everything has a proper defined function/files.