How to plot a polynomial function multiplied by a row vector

12 次查看（过去 30 天）
Maud
Maud 2014-11-17
评论： Thorsten 2014-11-17
Hello!
My question is how to make a function file which will plot a polynomial function p(x)=a0+ a1x^1 + a2x^2 + a3x^3 + .... + amx^m.
I know how to plot a polynomial function from this form: 1 + x + x^2 + x^3+ ... + x^M, which is for k = 0:M p = p + x.^k end; plot(x,p);
But I don't know how I can multiply the multiple parts with a certain variable.
Does anyone know how to do this?

请先登录，再回答此问题。

回答（1 个）

Thorsten
Thorsten 2014-11-17
for k = 0:M
p = p + a(k+1)*x.^k;
end;
  2 个评论
Maud
Maud 2014-11-17
Thanks! But do you also know how to program it with a as a row vector? For example, when I need to make the function with a series of particular numbers as the variables, so when the number is 9870225, the polynomial function will be : 9 + 8x + 7x^2 + 0x^3 + 2x^4+ 2x^5 + 5x^6
Thorsten
Thorsten 2014-11-17
You can generate the variable "a" from your number as follows
v = 9870225;
N = ceil(log10(v));
for i = 1:N
a(N-i+1) = rem(v, 10);
v = floor(v/10);
end

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Polynomials 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by