if function for array

Hello I have a programm, that looks something like this:

x=[52.23;52.45;56.32;55.48;56.32;53.39;55.53;53.67;57.89]

plot(x)

and now i would like my program to draw the dots of numbers 52 till 54 and 54 till 56 and 56 till 58 in seperate graphs, how do i do this? i wanted to solve this by using if but it doesnt quite work.

thank you for the help!

[KALYAN ACHARJYA]

to draw the dots of numbers 52 till 54, what does it mean?

[Jan]

"solve this by using if but it doesnt quite work" - post the code and the error message. This is much better than letting the readers guiess, what you try and observe.

Answer 1

[dpb]

I have a little utility function ("syntax sugar") for such things...

plot(x(iswithin(x,52,54)))

where

>> type iswithin.m

function flg=iswithin(x,lo,hi)
% returns T for values within range of input
% SYNTAX:
%  [log] = iswithin(x,lo,hi)
%      returns T for x between lo and hi values, inclusive

  flg= (x>=lo) & (x<=hi);
>> 

Answer 2

[Jan]

x=[52.23;52.45;56.32;55.48;56.32;53.39;55.53;53.67;57.89]
subplot(2,2,1)
plot(x)

subplot(2,2,2)
index = find(52 < x && x <= 54);
plot(index, x(index));

subplot(2,2,3)
index = find(54 < x && x <= 56);
plot(index, x(index));

subplot(2,2,4)
index = find(56 < x && x <= 58);
plot(index, x(index));