Parse Error at '>' Issue

7 次查看（过去 30 天）
Aniket Doke
Aniket Doke 2017-3-23
编辑： Roger Stafford 2017-3-24
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.

请先登录，再回答此问题。

回答（4 个）

Steven Lord
Steven Lord 2017-3-23
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.
  2 个评论
Aniket Doke
Aniket Doke 2017-3-24
The condition for <900 gives me correct answer. When I add one more constraint (>700), it gives me an error.
Roger Stafford
Roger Stafford 2017-3-24
编辑：Roger Stafford 2017-3-24
@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

请先登录，再进行评论。

dpb
dpb 2017-3-23
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);
Roger Stafford
Roger Stafford 2017-3-23
Also you cannot use the short-circuit && on vectors, only on scalars.
Walter Roberson
Walter Roberson 2017-3-24
a = data(data(:,1) <900 & data(:,1) >700);
  1 个评论
Aniket Doke
Aniket Doke 2017-3-24
Great. I got the correct answer with this! Thanks!

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Time Series Collections 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by