How to show a equation?

Hi MATLAB Community,

I Would to show a equation in the follow expression :

T = a1*f1+a2*f2+a3*f3+...+an*fn.

The vector there are all coeficient (a) and also the matriz (f), (depend of result the code previously).

I would to have a idea, how to build a structure, for take the value present in vector (a) and matriz (f), and show the equation example before. (The quantity of element can be different).

%Example:
a = [ 1 2 3]  %vector of coefficient (in this case n=3)
T = 1.*F1+2*F2+3*F3; % Equation built

Could help me?

Thank you.

Guilherme

Answer 1

[John D'Errico]

X = sym('X',[1,3]);
coeff = rand(1,3);
vpa(sum(X.*coeff),5)

ans =
0.022414*X1 + 0.053832*X2 + 0.14087*X3

[Afifah Shabrina]

clc;

clear all;

data = load('hypodd.reloc');

x = data(:,3); %Bujur

y = data(:,2); %Lintang

z = data(:,4); %Kedalaman Gempa

A = [x y ones(length(x),1)];

[cc,bint,r,rint,stats]= regress(z,A);

% PLOT PEMODELAN

scatter3(x,y,z);

hold on;

x_grid=119:0.05:120;

y_grid=-3.2:0.05:-2.2;

[XFIT, YFIT]=meshgrid(x_grid, y_grid);

AFIT=cc(1)*XFIT+cc(2)*YFIT+cc(3);

surf(XFIT,YFIT,AFIT);

set(gca,'ZDir','rev')

% LABEL

title('\fontsize{14}Model Bidang Sesar Bedasarkan Hiposenter Gempa');

legend('Hiposenter',1);

xlabel('Longitude')

ylabel('Latitude')

zlabel('Depth in Kilometers')

Hello, can you help me to show the equation of AFIT=cc(1)*XFIT+cc(2)*YFIT+cc(3) this?