Matlab --> quick question

lewdtenant

1. The problem statement, all variables and given/known data

suppose I want to set a = [0:64] with an output of 9 increments. For the life of me I cannot remember how to do this other than doing it brute force style.

2. Relevant equations

3. The attempt at a solution

since 64/9=7.11 then, a =[0:7.11:64] gives me 9 increments but I know there's a better way to do this. please help, thanks.

FrogPad

help linspace

lewdtenant

yes, thanks

N468989

is there a way that i can plot more points in the x-axis and the y-axis? instead of going by 5 -10 -15- 20 and go 5 - 6 - 7 - 8 - 9...20 .

lewdtenant

well, I'm no matlab expert, but here goes.

When you specify x and y, making x= [5:1:20] will give you 5, 6, 7, 8... 20. you can do this for y also. then when you plot (x, y) it should give you what you need.

i hope that helps, let me know if i misunderstood your question.

N468989

if i plot x= [5:1:20] and y= [5:1:20], the axes spacing goes 5,10,15,20, but i would like to make it go 1 by 1. thus showing more points in the plot.

not sure if that is possible, but that´s why im asking i guess.

thanks for your help btw

LeBrad

Quote by tko_gx

if i plot x= [5:1:20] and y= [5:1:20], the axes spacing goes 5,10,15,20, but i would like to make it go 1 by 1. thus showing more points in the plot.

not sure if that is possible, but that´s why im asking i guess.

thanks for your help btw

I think you're just referring to the tick marks on the axis. The distribution of tick marks is not related to the number of points plotted on the graph. You can change the tick mark distribution either going to 'axis properties' in the 'edit' menu of the plot, or you can define them from the command line. For example,

Code:

x = -pi:.1:pi;
y = sin(x);
plot(x,y)
set(gca,'XTick',-pi:pi/2:pi)
set(gca,'XTickLabel',{'-pi','-pi/2','0','pi/2','pi'})

defines the tick placement and the labels.

N468989

thank you very much. thats exactly what i meant to say.

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N468989	Matlab --> quick question is there a way that i can plot more points in the x-axis and the y-axis? instead of going by 5 -10 -15- 20 and go 5 - 6 - 7 - 8 - 9...20 .

lewdtenant	well, I'm no matlab expert, but here goes. When you specify x and y, making x= [5:1:20] will give you 5, 6, 7, 8... 20. you can do this for y also. then when you plot (x, y) it should give you what you need. i hope that helps, let me know if i misunderstood your question.