Unrecognized function or variable
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clear all
clc
range = 1;
t = -range:0.01:range;
w = 1;
P = unit(t+w/2)-unit(t-w/2);
plot(t,P,'Linewidith',5)
grid on
axis([-range-1 range+1 0 1])
title('Rectangel Function');
xlabel('Time(sec)');
ylabel('p(t)');
line([0 0],ylim,'color','r', 'Linewidth',2)
line(xlim,[0 0],'color','r', 'Linewidth',2)
The error I get is as follows. I don't know how to fix this problem. Thank you in advance for your help.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/551717/image.png)
3 Comments
SALINI BALASUBARAMANIUM
on 28 Mar 2022
function [Abar, xbar] = ATPL(K,xcord,initiator,omega,phi,M,N,sigma)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Joint Clock Synchronization and Ranging:
% Asymmetrical Time-stamping and Passive Listening
%
% IEEE Signal Processing Letters, 20 (1): 51 - 54, Jan 2013
% Sundeep Prabhakar Chepuri, CAS, TU Delft.
%
% ATPL script (1 sensor and 10 anchors, or vice versa)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
ii= initiator;
speed = 3*10^8;
%observation window
ObsrvWindow = linspace(1,100,K); %1:100; % [s]
for k=1:K
T_i(k,1) = ObsrvWindow(k);
for jj =1:M+N
if(jj==ii)
R_ji(k,jj) = 0;
continue;
end
R_ji(k,jj) = T_i(k,1) + (norm(xcord(:,ii)-xcord(:,jj),2))/speed;
R_ji(k,jj) = omega(jj)*(R_ji(k,jj)+ sqrt(0.5*sigma^2)*randn(1,1)) + phi(jj);
%R_ji(k,jj) = omega(jj)*(R_ji(k,jj)) + phi(jj);
end
T_i(k,1) = omega(ii)*(T_i(k,1) + sqrt(0.5*sigma^2)*randn(1,1)) + phi(ii);
% T_i(k,1) = omega(ii)*(T_i(k,1)) + phi(ii);
end
A1 = []; A2 = []; E1 = []; E2 = [];
for jj = 1:M+N
if (jj==ii)
continue;
elseif (jj <ii)
A1 = blkdiag(A1,-[R_ji(:,jj) ones(K,1)]);
else
A2 = blkdiag(A2,-[R_ji(:,jj) ones(K,1)]);
end
end
tempsizeA1 = size(A1); tempsizeA2 = size(A2);
A1 = [A1; zeros(tempsizeA2(1),tempsizeA1(2))];
A2 = [zeros(tempsizeA1(1),tempsizeA2(2));A2];
A3 = kron(ones(M+N-1,1),[T_i ones(K,1)]);
A = [A1 A3 A2];
temp_comb = nchoosek(1:M+N,2);
%tempS = [1 2]; tempA = [1 3; 2 3];
% colConstrComp = 1;
% colConstr = 2:3;
%tauknwn = [1 2 3 4 6 7 8 10 11 13];
%tauunknwn = [5 9 12 14 15];
tauknwn = find(temp_comb(:,2)~=M+N).';
tauunknw = find(temp_comb(:,2)==M+N).';
E = zeros((M+N-1)*K,length(temp_comb));
flag=0;
tau_i = zeros(length(temp_comb),1);
for jj=1:size(temp_comb,1)
tau_i(jj) = (norm(xcord(:,temp_comb(jj,1))-xcord(:,temp_comb(jj,2)),2))/speed;
end
for vertjj = 1:M+N-1
for horjj=flag+1:length(temp_comb)
if (temp_comb(horjj,1)==ii || temp_comb(horjj,2)==ii) %
E ((vertjj-1)*K+1:vertjj*K,horjj) = ones(K,1);
tau_i(horjj) = (norm(xcord(:,temp_comb(horjj,1))-xcord(:,temp_comb(horjj,2)),2))/speed;
flag=horjj;
break;
end
end
end
Abar = [A(:,1:2*(M+N-1)) E(:,tauunknw)];
xbar = -A(:,2*(M+N-1)+1:end)*[1;0]- E(:,tauknwn)*tau_i(tauknwn);
% Abar = [A(:,1:2*(M+N-1)) E];
% xbar = -A(:,2*(M+N-1)+1:end)*[1;0];
Oaux = ones(M+N-1,1)*ones(M+N-1,1)';
Rmat = 0.5*sigma^2*kron(Oaux, eye(K)) + 0.5*sigma^2*eye((M+N-1)*K);
[V,D] = eig(Rmat);
W = sqrt(inv(D))*V.';
Abar = W*Abar;
xbar = W*xbar;
Image Analyst
on 28 Mar 2022
@SALINI BALASUBARAMANIUM , not sure how your code fixes the "Unrecognized function or variable" error that was mentioned in this year-old question where the user was tring to implement the Heaviside step function. Did you post it here by mistake?
Answers (3)
the cyclist
on 15 Mar 2021
To my knowledge, there it no MATLAB function named unit().
I also used the search bar in the documentation, and did not find anything.
Where did you get this code? Maybe you are missing a second file, that has a user-defined function with that name?
3 Comments
Image Analyst
on 15 Mar 2021
So I guess it's solved now since you accepted this answer? Was the solution to use uint32() like I suggested in my answer below?
Image Analyst
on 15 Mar 2021
Why did you think it knows what unit is? It does not.
If, by chance, you want to convert to integer use uint32() instead of unit(). Be careful of the location of the "i" and the "n".
3 Comments
Image Analyst
on 15 Mar 2021
There is no property 'Linewidith', like it says. Watch your spelling again. You have 3 i's instead of 2. It should be 'LineWidth'.
Ronielson LIma
on 2 Nov 2021
Good Nitght.
Can you help me please.
Unrecognized function or variable 'distinguishable_colors'.
Error in drawPR (line 8)
methods_colors = distinguishable_colors(length(methods));
3 Comments
Walter Roberson
on 3 Nov 2021
You need to install the File Exchange contribution https://www.mathworks.com/matlabcentral/fileexchange/29702-generate-maximally-perceptually-distinct-colors
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