unable to plot this equation

Question

shiv gaur 2022-2-23

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1656290-unable-to-plot-this-equation

编辑： Arif Hoq 2022-2-23

t=1:20;

a(1)=1;

b(1)=1;

c(1)=1;

I=0.5;

a=1;b=3;

c=1;

d=5

r=0.0001;

s=4;

xr=-1.6

sumx=0;

sumy=0;

sumz=0;

for i=1:20

a(i+1)=(-a*a(i).^3+b*a(i).^2+b(i)-c(i)+I)/(i+1)

b(i+1)=(c-d*a(i)^2-b(i))/(i+1);

c(i+1)=r*((s*(a(i)-xr)-c(i)))/(i+1);

sumx=sumx+a(i)*t.^i;

sumy=sumy+b(i).*t.^i;

sumz=sumz+c(i).*t.^i;

end

plot(t,sumx)

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Arif Hoq 2022-2-23

so what is the value of a ? it can not be a scalar.here a =1. it should be a vector or matrix

shiv gaur 2022-2-23

so a is the vector you can take a is the parameter scalar a(i) is the vector so you can take replacement as a=m

for simplicity edit program is here

t=1:20;

a(1)=1;

b(1)=1;

c(1)=1;

I=0.5;

m=1;b=3;

c=1;

d=5

r=0.0001;

s=4;

xr=-1.6

sumx=0;

sumy=0;

sumz=0;

for i=1:20

a(i+1)=(-m*a(i).^3+b*a(i).^2+b(i)-c(i)+I)/(i+1)

b(i+1)=(c-d*a(i)^2-b(i))/(i+1);

c(i+1)=r*((s*(a(i)-xr)-c(i)))/(i+1);

sumx=sumx+a(i)*t.^i;

sumy=sumy+b(i).*t.^i;

sumz=sumz+c(i).*t.^i;

end

plot(t,sumx)

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Answer 1

Arif Hoq 2022-2-23

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1656290-unable-to-plot-this-equation#answer_902515

在 MATLAB Online 中打开

i have considered the variable with random number

t=1:20;

I=0.5;

a=randi(20,1,20);

b=randi(30,1,20);

c=randi(30,1,20);

m=1;

d=5;

r=0.0001;

s=4;

xr=-1.6;

sumx=0;

sumy=0;

sumz=0;

C=cell(1,3);

for i=1:20

C{i,1}=(-m*a(i).^3+b*a(i).^2+b(i)-c(i)+I)/(i+1);

C{i,2}=(c-d*a(i)^2-b(i))/(i+1);

C{i,3}=r*((s*(a(i)-xr)-c(i)))/(i+1);

sumx=sumx+C{i,1}.*t.^i;

sumy=sumy+C{i,2}.*t.^i;

sumz=sumz+C{i,3}.*t.^i;

end

plot(t,sumx)

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shiv gaur 2022-2-23

so you are req to plot as same value not random value

Arif Hoq 2022-2-23

编辑：Arif Hoq 2022-2-23

在 MATLAB Online 中打开

do you mean?

a =ones(1,20,1)
a = 1×20
     1     1     1     1     1     1     1     1     1     1     1     1     1     1     1     1     1     1     1     1
b=repmat([2 2 2 2 2],1,4)
b = 1×20
     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2     2
c=repmat([3 3 3 3 3],1,4)
c = 1×20
     3     3     3     3     3     3     3     3     3     3     3     3     3     3     3     3     3     3     3     3

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unable to plot this equation

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