Question

@Euler271 or anyone else, please help. matlab question!
syms x
y=sin(x^2)*cos(x)
dy=diff(y,x)
a=ezplot(y,[-pi,pi]);
hold on
b=ezplot(dy,[-pi,pi]);
grid on
title(['Graphs of y=sin(x^2)cos(x) and dy/dx by Bishwo Gurung']);
xlabel('x-axis');
ylabel('y-axis');
set(a,'Color', 'blue', 'LineWidth', 2);
set(b,'Color', 'red', 'LineWidth',2, 'LineStyle', '--');
legend('sin(x^2)cos(x)', 'dy/dx','Location', 'NorthEastOutside');

so, on the set command. i made y blue and dy red. but the figure makes the y red instead and dy blue instead. help?

Answer 1

@e.mccormick I don't understand this language

Answer 2

it's computer science , put it there, they will help you

Answer 3

It is matlab. Matlab is a mathematics software. @robtobey uses it, but he is off. They have some tutorials on their web site.

Answer 4

this is the matlab of calc3

Answer 5

http://mcise.uri.edu/sadd/mce372/Vector%20Calculus%20MATLAB.pdf
http://archives.math.utk.edu/ICTCM/VOL12/C021/paper.pdf
http://www.youtube.com/playlist?list=PL1E4E41F27812EEE8
http://www2.math.umd.edu/~jmr/241/calc.htm

Answer 6

try swapping a=ezplot(y,[-pi,pi]);

b=ezplot(dy,[-pi,pi]);

the reason is you are plotting a first and then you are using HOLD ON. meaning it acquires value of a first which in this case based on the code is dy and then it plot b on it

try this first , lets see if it works

Answer 7

i just checked. the graph was right the whole time. i mistook the dy graph for y and vice versa. silly me lol

Answer 8

but thx guys :)

Answer 9

@e.mccormick

I use Mathematica 8, Home Edition, the only mathematics software I'm familiar with.

Answer 10

Ah, sorry. Rememberd the wrong software for you!

Answer 11

np