Using Solver to solve equations with unknown x, how can i get all the answers sorted out.

Trying to make a solver for one uknown x, but im having some issues with getting all the answers sorted out without having to write and "if" and "elseif" for every number of solutions. Is there some function that can do this for me?

syms x % z = input x = solve(z) xx = double(x)

% num2str(length(svar))

disp(['There is ',num2str(length(x)),' solutions'])

if length(xx)==1;

    x = xx(1)

elseif length(xx)==2;

    x = xx(1);
    x = xx(2);

end

Answer 1

[Star Strider]

You can eliminate the ‘if...else’ block and simply write:

x = xx

[Star Strider]

Thomas Drotningsvik’s Answer moved here:

That was easy, still new to matlab :) Possible to get them up as x1, x2, x3...?

[Thomas Drotningsvik]

and at the same time how can i get it to loop over to start again when i found the x values, so it will keep going until i stop it.

[Star Strider]

This construction is highly frowned upon because it is extremely inefficient, but if you must, you can do it this way:

for k1 = 1:size(xx,1)
    eval(sprintf('x%d = %f', k1, xx(k1)));
end
x1
x2

I don’t understand. What are you looping through? Do you have more than one function of ‘x’ you’re evaluating?

You would probably start the loop just after the ‘syms x’ statement (including whatever you want to input), and including my highly inefficient eval loop. You might do this in a while loop, checking for input and with an if...then...else block, if the input string was empty, break and stop iterating.

[Thomas Drotningsvik]

Thanks again, no need for the looping part :)

[Star Strider]

My pleasure!

I strongly suggest keeping ‘xx’ as its default vector. You can easily access its elements in a loop if you need to. If you want to print them out as ‘x1’, ‘x2’, etc., use this sort of loop:

for k1 = 1:size(xx,1)
    fprintf(1,'\n\tx%d = %f\n', k1, xx(k1))
end