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Error in plotting a piecewise function.

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Amna Habib
Amna Habib 2023-6-19
评论： Amna Habib 2023-6-22
I am trying to plot the a piecewise function. But the system is showing an error.
Kindly help to find this error.
X = 0:0.01:60 ;
f = double(X<10).* (0) + ...
double(and(X>=10,X<20)).* (0.2 + ((0.2).*(x-10))./10) + ...
double(and(X>=20,X<30)).* (0.4 + ((0.2).*(x-20))./10) + ...
double(and(X>=30,X<40)).* (0.6 + ((0.2).*(x-30))./10) + ...
double(and(X>=40,X<50)).* (0.8 + ((0.2).*(x-40))./10) + ...
double(X>=50).*(1);
g = double(X<10).* (1) + ...
double(and(X>=10,X<20)).* (0.2 + ((0.2).*(20-x))./10) + ...
double(and(X>=20,X<30)).* (0.4 + ((0.2).*(30-x))./10) + ...
double(and(X>=30,X<40)).* (0.6 + ((0.2).*(40-x))./10) + ...
double(and(X>=40,X<50)).* (0.8 + ((0.2).*(50-x))./10) + ...
double(X>=50).*(0);
figure;
plot(X,f,'r','linewidth',2);
hold on ;
plot(X,g,'b','linewidth',2);
xlabel('X');
grid on;
xticks(2:1:10);
legend('f(x)','g(x)')
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Command window:
Error in empirical (line 2)
f =double(X<10).* (0) + ...
X = 0:0.01:60 ;
f = double(X<10).* (0) + ...
double(and(X>=10,X<20)).* (0.2 + ((0.2).*(x-10))./10) + ...
double(and(X>=20,X<30)).* (0.4 + ((0.2).*(x-20))./10) + ...
double(and(X>=30,X<40)).* (0.6 + ((0.2).*(x-30))./10) + ...
double(and(X>=40,X<50)).* (0.8 + ((0.2).*(x-40))./10) + ...
double(X>=50).*(1);
g = double(X<10).* (1) + ...
double(and(X>=10,X<20)).* (0.2 + ((0.2).*(20-x))./10) + ...
double(and(X>=20,X<30)).* (0.4 + ((0.2).*(30-x))./10) + ...
double(and(X>=30,X<40)).* (0.6 + ((0.2).*(40-x))./10) + ...
double(and(X>=40,X<50)).* (0.8 + ((0.2).*(50-x))./10) + ...
double(X>=50).*(0);
figure;
plot(X,f,'r','linewidth',2);
hold on ;
plot(X,g,'b','linewidth',2);
xlabel('X');
grid on;
xticks(2:1:10);
legend('f(x)','g(x)')

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采纳的回答

Ayush Kashyap
Ayush Kashyap 2023-6-19
As per my understanding, one direct reason for error is that the variable x is not defined in the script but is used to define the piecewise functions for f and g. Instead, you should be using the variable X that is defined as a range of values in your script.
To fix the error, you simply need to replace all occurrences of x with X in the definition of f and g.
  2 个评论
Amna Habib
Amna Habib 2023-6-22
Hi @Ayush Kashyap,
Can you please mark the error in the following code?
I'm facing the error:
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);
>> linear
Linear Function:
Parameters: [1x1 struct]

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更多回答（1 个）

Poorna
Poorna 2023-6-19
hi amna,
i think some of the the letter 'x' is replaced by small x instead of capital X rectify it it will work

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