How to write a mathematical function in MATLAB?

Question

Swati Sarangi 2020-11-4

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评论： Swati Sarangi 2020-11-5

Hi All,

I want to write velocity vector in terms of its component in x, y and z direction , say V= V(t)_x i^+V(t)_y j^+V(t)_z k^. These components are functions of time.

Then I want to differentiate that function with respect to time.

How to do that ?

Any suggestion will be appreciated!

Thanks in advance.

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Swati Sarangi 2020-11-5

Hello Rik,

I got the idea for my doubt. Along with that I want to display the vector V as a whole whose individual components are inputted by the users.

This is my code snippet.

m=input("Enter the mass of the particle")

V_x=input("Enter the x component of velocity of the particle,(V_x i)")

V_y=input("Enter the y component of velocity of the particle, (V_y j)")

V_z=input("Enter the z component of velocity of the particle ,(V_z k)")

disp("The velocity vector of the particle is %f i+ %f j+%f k ") ----> In this line , which format specifier shold I use to display vector V as a whole (with its individual componenets)

Thanks! :)

Swati Sarangi 2020-11-5

Yeah, I got what I was looking for

disp("The velocity vector of the particle is")

disp(V_x*i+V_y*j+V_z*k)

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Answer 1

VBBV 2020-11-4

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/635990-how-to-write-a-mathematical-function-in-matlab#answer_534010

编辑：VBBV 2020-11-4

在 MATLAB Online 中打开

%if true
  % code
% end
syms t i j k
vx = t^2;
vy = t^3;
vz = t^4;
V = @(t) vx*i+vy*j+vz*k;
VV = diff(V,t);% differentiate

Use symbolic expressions and diff function

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Walter Roberson 2020-11-4

no the i^ and so on indicate different unit vectors along different axes.

You probably need to introduce new symbolic variables to stand in for the components, and add logic to handle raising them to various powers using mapSymType.

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