Unrecognized function or variable

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.

[Kutlu Yigitturk]

FIXED!!

You must add this code to your editor, in this way you call unit() function.

function y = unit(x)

y = zeros(size(x));
y(x>0) = 1
end

[SALINI BALASUBARAMANIUM]

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]

@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?

Answer 1

[the cyclist]

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?

[Kutlu Yigitturk]

I got it from the codes that the university professor explained in the lecture. I mean, this code is entirely the of the professor. Could something be caused by license invalid?

[Image Analyst]

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?

[Kutlu Yigitturk]

Thank you for your attenton. I fixed the problem with unusually way. I show the solution top side.

Answer 2

[Image Analyst]

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".

[Kutlu Yigitturk]

clear all 
clc

range = 1;
t = -range:0.01:range;
w = 1;

p = uint32(t+w/2)-uint32(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)

I did what you said but I still get an error.

[Image Analyst]

There is no property 'Linewidith', like it says. Watch your spelling again. You have 3 i's instead of 2. It should be 'LineWidth'.

[Kutlu Yigitturk]

Thank you for your attenton. I fixed the problem with unusually way. I show the solution top side.

Answer 3

[Ronielson LIma]

Good Nitght.

Can you help me please.

Unrecognized function or variable 'distinguishable_colors'.

Error in drawPR (line 8)

methods_colors = distinguishable_colors(length(methods));

[Image Analyst]

This is in no way an answer to @Kutlu Yigitturk. Please post your code in a new question after you read this link:

TUTORIAL: How to ask a question (on Answers) and get a fast answer

All I can say until then is what the error said, and that is that you never defined distinguishable_colors at all so your program has no idea what it is or should be. Only you know that but you have to tell your program that.

[Walter Roberson]

You need to install the File Exchange contribution https://www.mathworks.com/matlabcentral/fileexchange/29702-generate-maximally-perceptually-distinct-colors

[Ronielson LIma]

It worked, thank you!