How to plot a linear piecewise function on matlab?

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Amna Habib
Amna Habib el 26 de Jun. de 2023
Comentada: Amna Habib el 26 de Jun. de 2023
Can you please mark the error in the following code?
I'm facing the error:
>> linear
Linear Function:
Parameters: [1x1 struct]
X = 0:0.001:50 ;
f = double(X<20).* (0) + ...
double(and(X>=20,X<35)).* ((X-20)./15) + ...
double(X>=35).*(1);
g = double(X<20).* (1) + ...
double(and(X>=20,X<35)).* ((35-(X))./(15)) + ...
double(X>=35).*(0);
figure;
plot(X,f,'r','linewidth',2);
hold on ;
plot(X,g,'b','linewidth',2);
xlabel('X');
xticks(2:1:10);
  3 comentarios
Dyuman Joshi
Dyuman Joshi el 26 de Jun. de 2023
The code expect for the first line you mentioned runs without any error. I am not sure what the command linear supposed to do, nor do we have the data of linear to run to reproduce the error.
If you are getting an error, copy and paste the full error, which means all of the red text.
Also, there's no need of using double().
X = 0:0.001:50 ;
f = (X<20).* (0) + (and(X>=20,X<35)).* ((X-20)./15) + (X>=35).*(1);
g = (X<20).* (1) + (and(X>=20,X<35)).* ((35-(X))./(15)) + (X>=35).*(0);
figure;
plot(X,f,'r','linewidth',2);
hold on ;
plot(X,g,'b','linewidth',2);
xlabel('X');
%xticks(2:1:10);
DGM
DGM el 26 de Jun. de 2023
... or just
% all you need to define a polyline are the vertices
x = [0 20 35 50];
f = [0 0 1 1];
g = [1 1 0 0];
plot(x,f,'r','linewidth',2);
hold on ;
plot(x,g,'b','linewidth',2);
xlabel('X');

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Respuestas (1)

Sam Chak
Sam Chak el 26 de Jun. de 2023
Might as well...
but this approach requires the fuzzy logic toolbox.
x = 0:0.1:50;
f = linsmf(x, [20 35]); % s-shaped function
g = linzmf(x, [20 35]); % z-shaped function
plot(x, [g; f]', 'linewidth', 2), grid on
xlabel('X');

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