Parse Error at '>' Issue

I have to select (and count) particular numbers from a series. The selection should have numbers less than 900 but more than 700. I was getting a parse error at '>' with below code. There is only 1 column.

a=data(data(:,1) <900 && >700);
n=numel(a)

Please let me know how can I get through this.

Answer 1

[Steven Lord]

You need to explicitly write what needs to be greater than 700 for the condition to be satisfied. MATLAB does not assume that you meant "data(:, 1) > 700" in that indexing expression.

[Aniket Doke]

The condition for <900 gives me correct answer. When I add one more constraint (>700), it gives me an error.

[Roger Stafford]

@Aniket Doke. I think you still don’t understand. You can’t write:

   A<900 & >700

That is incorrect syntax in matlab. You must write:

   A<900 & A>700

Answer 2

[dpb]

I use a utility "syntactic sugar" for such purposes...

a=isinside(a,700,900);

where

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

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

[Aniket Doke]

Okay. I will give it a try! Thanks!

Answer 3

[Roger Stafford]

Also you cannot use the short-circuit && on vectors, only on scalars.

[Aniket Doke]

Understood. Thanks!

Answer 4

[Walter Roberson]

a = data(data(:,1) <900 & data(:,1) >700);

[Aniket Doke]

Great. I got the correct answer with this! Thanks!