Plotting Functions using For Loop and If Statements?

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Nicholas Ross
Nicholas Ross 2021-2-17
编辑： KALYAN ACHARJYA 2021-2-17
Hey all,
I'm attempting to write a program using a for loop and conditional statements for the following:
I thought this was a very simple assignment but however when I try to implement my code my plot comes up completely blank. This is my first time working with MATLAB so apologies if this is trivial to most of you. Could someone help me understand what I'm doing wrong? Thanks in advance.
Below is my code:
t=0;
x1= ((t.^2)-(2*t)+3);
x2 = (4*cos((2*pi*t)-(pi/8))+3*sin(2*pi*t));
x3 = (sinc(t));
figure(1);
hold on
for i= -4:0.1:4
if (i> - 4) && (i< -2)
t = i;
y = x1;
elseif (i >-2) && (i < 2)
t = i;
y = x2;
elseif (i > 2) && (i< 4)
t = i;
y = x3;
end
plot(t,y)
end

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KALYAN ACHARJYA
KALYAN ACHARJYA 2021-2-17
编辑：KALYAN ACHARJYA 2021-2-17
t=-4:0.1:4
x1= (t.^2)-(2*t)+3;
x2 = 4*cos((2*pi*t)-(pi/8))+3*sin(2*pi*t);
x3 = sinc(t);
y=zeros(1,length(t));
for i=1:length(t)
if (t(i)>-4) && (t(i)< -2)
y(i)= x1(i);
elseif (t(i)>-2) && (t(i) < 2)
y(i)= x2(i);
else
y(i)= x3(i);
end
end
figure,plot(t,y);
Important: Here you can avoid loop and if else condition (recommended), please try once, we are here to help you.
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KALYAN ACHARJYA
KALYAN ACHARJYA 2021-2-17
This is logical indexing, Here the links
https://blogs.mathworks.com/loren/2013/02/20/logical-indexing-multiple-conditions/
https://in.mathworks.com/help/matlab/matlab_prog/techniques-for-improving-performance.html

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