MATLAB: How to create a step response with the following unit step function as input

controlControl System ToolboxinputMATLABresponsestepstep responsetftheory

input : F

when (0<t), F = 3

when (0.98<t) = 6

I want to make step response with that unit step function as input in matlab…

please help me..

Best Answer

F = @(t) (t < .98) * 3 +(t > .98) * 6
fplot(F,[0,2])

Related Solutions

MATLAB: I need your help. y'(t) = -30y+30t^2+2t; y(0)=1, & exact solution is y(t)=e^-30x +x^2. i can’t understand what is different b/w kr4 plotting & its error . i need both graph n error please send me code.

Are you trying to plot the result? If so, just save the integration step results in a matrix:

function rungekutta123
h = 0.05;
t = 0:0.05:2.5;
w(1) = 1;
fprintf('Step 0: t = %12.8f, w = %12.8f\n', t, w);
for ii=1:(length(t)-1)
    k1 = h*f(t(ii),w(ii));
    k2 = h*f(t(ii)+h/2, w(ii)+k1/2);
    k3 = h*f(t(ii)+h/2, w(ii)+k2/2);
    k4 = h*f(t(ii)+h,   w(ii)+k3);
    w(ii+1) = w(ii) + (k1+2*k2+2*k3+k4)/6;
    fprintf('Step %d: t = %6.4f, w = %18.15f\n', ii, t(ii), w(ii));
end
y_exact = exp(-30.*t) + t.^2;
subplot(2,1,1)
plot(t,w,t,y_exact)
ylabel('Exact vs. approximated function')
subplot(2,1,2)
plot(t,w - y_exact)
ylabel('Error')
%%%%%%%%%%%%%%%%%%
function v = f(t,y)
v = -30*y+30*t^2+2*t;

MATLAB: Invalid index into an array of size {6, 22} with 132.

This might be because you are assigning first element of soilInfo (which is a matrix) to soiltype and second element (which is a character) to soliState.

% [soilType; soilState; frAdd]

I assume from this comment that soilType and soilState are first and second elements of the matrix [1;1;0] in soilInfo. You may define soilType and soilState as

 soilType = soilInfo{1}(1);
 soilState = soilInfo{1}(2);

Also use soilType and soilState values such that they are less than 6 and 22 respectively for DxMap matrix defined above

Best Answer

Related Solutions

MATLAB: I need your help. y'(t) = -30*y+30*t^2+2*t; y(0)=1, & exact solution is y(t)=e^-30*x +x^2. i can’t understand what is different b/w kr4 plotting & its error . i need both graph n error please send me code.

MATLAB: Invalid index into an array of size {6, 22} with 132.

Related Question

MATLAB: I need your help. y'(t) = -30y+30t^2+2t; y(0)=1, & exact solution is y(t)=e^-30x +x^2. i can’t understand what is different b/w kr4 plotting & its error . i need both graph n error please send me code.