MATLAB: The output is not simplified to one number

it suppose shows one number

Hi guys,

I need help with this issue please.

my output are not simplified at all. For example on of the outputs is

>> P(1)
ans =
(3931879*sin(exp(1) - 2))/4000000 - (1862469*sin(exp(2) - 2))/80000000 + (45497457*sin(exp(1/3) - 2))/40000000 - (18734247*sin(exp(2/3) - 2))/16000000 - (8607627*sin(exp(4/3) - 2))/16000000 + (6776217*sin(exp(5/3) - 2))/40000000 - (35386911*sin(1))/80000000

This all in on line i should has a one number instead of all this long expression

Best,

Best Answer

vpa(P(1))

if you want to evaluate to a symbolic number with some number of decimal places.

double(P(1))

if you want to evaluate to a double precision floating point number.

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MATLAB: Dsolve giving implicit solution

Look at documentation on ode45. You don't need a symbolic solution if you just want to get T as a function of t.

Like the following, for example:

tspan = [0 1];  % replace the 1 with your desired end time
T0 = 673;
[t, T] = ode45(@dTdtfn, tspan, T0);
plot(t,T),grid
xlabel('time'),ylabel('Temperature')
function dTdt = dTdtfn(~,T)
        % Define A B C and D
        A = 10^-6; B = 1; C = 1; D = 10^-2;  % Replace with your values
        dTdt = B + C - A*(T^4) - D*T;
end

MATLAB: Solving non-linear equations – not enough input arguments

The way you’ve written your code, I believe you want the fsolve function instead.

Try this:

f = fsolve(@ts1, x0, options)

Best Answer

Related Solutions

MATLAB: Dsolve giving implicit solution

MATLAB: Solving non-linear equations – not enough input arguments

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