Solving an equation involving variables as column vector using 'solve' function

%arrayTest
A=[1;2; 12; 3; 3; 4] 
b= [1; 2; 12; 3; 3; 4]


sym tx1
sym tS

x1 = [1:numel(A)]; %row vector
tx1 = transpose(x1) %column vector

S=[1:numel(A)]; %row vector
tS=transpose(S) %column vector

for i = transpose(1:numel(A)) %intializing loop from 1 till the number of rows of A
    for j=1 %number of column = 1
    tS(i,j) = solve( 1.*b + x1.*A == 0, tx1(i,j)) %solve equation
    end
end

%Error

%Check for missing argument or incorrect argument data type in call to function 'solve'.

%Error in TEST_array (line 28)
    %tS(i,j) = solve( 1.*b + tx1.*A == 0, tx1(i,j))
    
    
  

Dear Experts!!:)

I am trying to solve an equation containing variables as column vectors. I have declared the symbolic variables and have tried to use the function solve.

I keep getting this error as an incorrect arugument data type for function solve!!

Can someone help me out with this error!??

And also, how can i create and display an array which stores all the solutions of the solve function??

[Walter Roberson]

 tS(i,j) = solve( 1.*b + x1.*A == 0, tx1(i,j)) %solve equation

tx1 is numeric. Why are you passing it to solve()?

[Sanjeet Sawant]

 tS(i,j) = solve( 1.*b + tx1.*A == 0, tx1(i,j)) %solve equation % missing t of tx1 added

Hi Walter, thank you for the reply!

My idea was to create an unknown variable tx1 having i rows and j columns and solve it using solve().

If that argument doen'nt work, then how can i pass a variable as an array into solve() and find out its value?

Or am i missing any basic concept of solving an equation?:D

Answer 1

[Ashish Mishra]

Hi Sanjeet

You want to solve the equation for tx1(i,j) but it is a constant array (from 6th line).

Moreover in your equation , everything is constant.

Follow these to documentation.

To solve a problem by passing argument as an array