plot function f(x)

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xavier
xavier 2020-5-21
评论： Walter Roberson 2023-6-28
Referring to figure below, plot the function f(x) in the domain −2 ≤ x ≤ 5 using Method 1 and Method 2.
a) Method 1: write a program in a script file using conditional statements and loops
b) Method 2: create a user-defined function for f(x) and then use the function in a script file to make the plot.
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xavier
xavier 2020-5-21
编辑：xavier 2020-5-21
method 1
x=[-2:5];
n=input('Enter the n value');
for k=1:n
S(k)=(-1)^k*k/2^k;
if x<=-1
y=20;
elseif x<=-1 & x<=1
y=(-5*x)+5;
elseif x<=1 & x<=3
y=(-10*x.^2)+(35*x)-21
elseif x<=3 & x<=4
y=(-5*x)+11;
elseif x>=4
y=-10;
end
end
xavier
xavier 2020-5-21
for the method 2
%PLOTTING MULTIPLE GRAPHS IN THE SAME PLOT Using
x=[-2:5];
y=20;
yd=-5*x+5;
ydd=(-10*x.^2)+35*x-21;
yddd=(-5*x)+11;
ydddd=-10;
plot(x,y,'--b',x,yd,'-c',x,ydd,'--y',x,yddd,'-g',x,ydddd,'--k')

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回答（2 个）

darova
darova 2020-5-21
Here are some suggestions for method 1
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xavier
xavier 2020-5-21
编辑：xavier 2020-5-21
sorry for asking walter, may i know which row do you refer ?
it is like this walter ?
darova
darova 2020-5-21
YOu can simply your if...else conditions
x = -2:0.1:5; % note the dot '0.1', not '0,2'
for k = 1:length(x)
if x(k) < -1
% condition 1
elseif x(k) < 1
% condition 2
elseif x(k) < 3
% condition 3
elseif x(k) < 4
% condition 4
else
% condition 5
end
end
plot(x,y)

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Sasika
Sasika 2023-6-28
f(x)=x^2+5*x-6 -8<x<3
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Walter Roberson
Walter Roberson 2023-6-28
That code will fail for non-scalar x, or for x numeric that is not either positive integer or else logical true or false. And it likely gives u desirable answers in most cases.
Please do some testing of your code before posting your solutions as Answer to a Question.

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