Error in plotting a piecewise function.

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)')

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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)')

Answer 1

[Ayush Kashyap]

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.

[Amna Habib]

Thanks a lot! I have found the error.

[Amna Habib]

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]

Answer 2

[Poorna]

hi amna,

i think some of the the letter 'x' is replaced by small x instead of capital X rectify it it will work

[Amna Habib]

Thanks a lot! I have found the error.