how to tabulate results of function in matlab

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fourough 2013-3-15

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回答： Dianne Dampil 2014-2-25

I have a program which I need to tabulate sin(t) function in t=[-3,3] and plot it in 50 points in this interval.My code is

 function inversehw3a
disp('      t       sin(t)')
for x=-3:6/50:3
    y=sin(x);
    A=[x,y];
    disp(A);
end
    x=-3:6/50:3;
    plot(x,sin(x)),grid on

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Answer 1

fourough 2013-3-15

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thanks for your help,but my problem is to show the values of t and sin(t) in table,such that it enables me to retrieve any value of table afterwards...like what we were doing before calculators become trendy(working with sinuns tables in hard copy, during exam)

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Image Analyst 2013-3-16

See the addition to the code I made that will print out the values in a table.

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Answer 2

Image Analyst 2013-3-15

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编辑：Image Analyst 2013-3-16

在 MATLAB Online 中打开

I probably would have used linspace() to avoid having to figure out what the step size needs to be - you just specify the 50 directly and it does it for you. I'd also vectorize the code like this:

x = linspace(-3, 3, 50);
y = sin(x);
% Plot it.
plot(x, y, 'bo-', 'LineWidth', 2);
grid on;
% Make labels:
fontSize = 30;
title('y = sin(x)', 'FontSize', fontSize);
xlabel('x', 'FontSize', fontSize);
ylabel('y', 'FontSize', fontSize);
% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0 0 1 1]);

EDIT

% Print out coordinates:
for k = 1 : length(x)
  fprintf('(x(%d), y(%d)) = (%.4f, %.4f)\n',...
    k, k, x(k), y(k));
end

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Answer 3

Dianne Dampil 2014-2-25

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how can i tabulate this?

%Modified eler method %mod.m

syms x y; f = input('Enter the slope : '); x0 = input('Enter the initial value of x:'); y0 = input('Enter the initial value of y: '); h = input('Enter the value of h:'); x1 = x0; y1 = y0;

for i=1:25 y1 = y0 + h * subs(f,{x,y},{(x0+1/2*h),(y0+1/2*h*subs(f,{x,y},{x0,y0}))}) x0 = x0 + h y0 = y1; end