change the origin of a graph

Hi,

I want to draw a graph and its origin must be in the upper left corner of output. The numbers should increase positively down the y-axis. How can I do this?

Thanks

Answer 1

[Sulaymon Eshkabilov]

x = 1:13; y = 2*x+3;
plot(x, y, 'r*--'), grid on
set(gca, 'YDir','reverse'), xlabel('x'), ylabel('y')

Answer 2

[Phong]

% I'm Nguyen Tien Phong, Hung Yen University of Technical Education

%This is an application program to plot multiple graphs on the same axes

%You guys edit it to be beautiful and suitable for multi-paragraph math problems

[e-mail]

%Good luck

clear all

syms z

y1=3*z^3+2 % Ve tu 0 den 10 Plot this graph from 0 to 10; starting position is 0

y2=3*z^4+2*z^2+6 % Ve tu 10 den 25 (0-10-10-15) Plot this graph from 0 to 15; starting position is 10

L1=10

L2=15

Xtong=linspace(0,L1+L2,20) % Chia thanh 20 doan boi 20 diem de cbi ve cho tat ca

Yt=zeros(1,20)% Tao ra de ve cac diem chia tren z cua tat ca cac doan i

X2=linspace(0,L1,100); % Chia doan 1 thanh 100 diem de ve do thi cho doan 1

A2=subs(y1,z,X2) % Nhan gia tri tai 100 diem de ve do thi cho doan 1

plot(Xtong,Yt,'Linewidth',1) % X tong la tong chieu dai de xac dinh chieu dai truc Z khi ve

hold on

plot(X2,A2,'g','Linewidth',4) % Do thi doan 1

Xve2=linspace(10,25,100); % Chia thanh 100 diem cho doan i=2 tro di

XXX2=linspace(0,L2,100)

B2=subs( y2,z,XXX2) % Nhan 100 gia tri de ve duong do thi

plot(Xve2,B2,'r','Linewidth',4); % Ve do thi

xlabel('Duong truc Z');

title(['Bieu do Nz ', ': kN'])