How to plot a linear piecewise function on matlab?

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Amna Habib
Amna Habib 2023-6-26
评论： Amna Habib 2023-6-26
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);
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Dyuman Joshi
Dyuman Joshi 2023-6-26
Ran in:
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 2023-6-26
Ran in:
... 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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回答（1 个）

Sam Chak
Sam Chak 2023-6-26
Ran in:
Might as well...
but this approach requires the fuzzy logic toolbox.
https://www.mathworks.com/help/fuzzy/linzmf.html
https://www.mathworks.com/help/fuzzy/linsmf.html
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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