Octave教程四：Plotting Data

Octave教程四：Plotting Data

octave:5>
octave:5>
octave:5> PS1 ('>> ')
>> t = [0:0.01:0.98];
>> y1 = sin(2*pi*4*t);
>> plot(t,y1);
>>

>> y2 = cos(2*pi*4*t);
>> plot(t,y2);
>>

>> plot(t,y1);
>> hold on;
>> plot(t,y2,'r');
>>

>>
>> xlable('time')
error: 'xlable' undefined near line 1 column 1
>> xlabel('time')
>> ylabel('value')
>> legend('sin','cos')
>> title('my plot')
>> cd 'C:\fakepath\octave4';
>> print -dpng 'myplot.png'
>>

>> close
>>
>>
>> figure(1);plot(t,y1)
>> figure(2);plot(t,y2)
>> subplot(1,2,1); %Divides plot a 1*2 grid,access first element
>> plot(t,y1);
>> subplot(1,2,1); %Divides plot a 1*2 grid,access first element
>> plot(t,y1);
>> subplot(1,2,2);
>> plot(t,y2);
>>

>> axis([0.5 1 -1 1])
>>

>> A = magic(5)
A =

   17   24    1    8   15
   23    5    7   14   16
    4    6   13   20   22
   10   12   19   21    3
   11   18   25    2    9

>> imagesc(A)
>>

>> imagesc(A),colorbar,colormap gray;
>>

>> imagesc(magic(30)),colorbar,colormap gray;
>>