How to plot different markers on the same graph based on "if" statement

Question

Jayden Yeo 2020-6-15

编辑： Jayden Yeo 2020-12-6

Hi,

I have a table of data as below. Based on "c", I would like to plot X and Y using 2 different markers.

i.e. if c="car", plot the X & Y coordinates using "o" type marker.

if c = "plane", plot the X & Y coordinates using "+" type marker.

My code as below:

if coordinates.c == "car"

plot(coordinates.X,coordinates.Y,"ro")

else

plot(coordinates.X,coordinates.Y,"b+")

end

The codes above is not working. Matlab plots all the X & Y coordinates using the "+" type marker.

Pls advise where is the issue. Thanks in advance

Answer 1

KSSV 2020-6-15

figure
hold on
idx = strcmp(c,'air') ; 
plot(x(idx),y(idx),'+r')
idx = strcmp(c,'land') ; 
plot(x(idx),y(idx),'+b')

Jayden Yeo 2020-6-15

Thanks, KSSV.

It works.