method to check for similarity using if...else loop

1 次查看(过去 30 天)
I have got a cell arrays as like -
selected_item = 'item3';
total_items = {'item1', 'item2', 'item3', item4', 'item5', 'item6'}
items are char.
'item1' and 'item4' are similar - undergoes same operation.
'item2' , 'item3' , 'item6' are similar - undergoes same operation.
'item5' is unique - undergoes different operation.
Now I want to perform operation only on 'item3' since that come into selected from previous codes.
I was trying to write something like this -
if selected_item == 'item2' || 'item3' || 'item6' % below code for item2, item3 and item6
........
........
........
else if selected_item == 'item1' || 'item4' % below code for item1 and item4
........
........
........
else % for item5
.........
end
I know above code does not work, its for explanation how i would like to do. Also it might be possible to put similar items in single variable -
type1_item = {'item2', 'item3', 'item6'};
than we can directly look if whatever comes in selected_item is present in type1_item or not. Is there any other method to resolve these??

采纳的回答

Guillaume
Guillaume 2018-3-23
Use ismember to test for set membership, not == or strcmp:
if ismember(selected_item, {'item2', 'item3, 'item6'})
%do something
If you use strcmp then you get a logical array, which you could reduce to a scalar value with any:
if any(strcmp(selected_item, {'item2', 'item3, 'item6'}))
%do something
ismember is more straightforward.
  1 个评论
Ghenji
Ghenji 2018-3-23
well i have tried both the methods and don't find much difference between them. There would be a difference off course else it would not exist. Anyways thanks to you guys again.

请先登录,再进行评论。

更多回答(1 个)

Birdman
Birdman 2018-3-23
编辑:Birdman 2018-3-23
The best workaround for this situation is to use strcmp:
if strcmp(selected_item,{'item2', 'item3', 'item6'})
%do sth
elseif strcmp(selected_item,{'item1', 'item4'})
%do sth
else
%do sth
end
Do not use == operator for string comparison.
[Edited]
if any(strcmp(selected_item,{'item2', 'item3', 'item6'}))
%do sth
elseif any(strcmp(selected_item,{'item1', 'item4'}))
%do sth
else
%do sth
end
  4 个评论
Ghenji
Ghenji 2018-3-23
编辑:Ghenji 2018-3-23
would these work too?
if strcmp(selected_item, type1_item) % item2,3,6 are elements of same variable
Birdman
Birdman 2018-3-23
编辑:Birdman 2018-3-23
Yes but it is missing, you should add any since containing at least one variable is enough for you:
if any(strcmp(selected_item,{'item2', 'item3', 'item6'}))
%do sth
elseif any(strcmp(selected_item,{'item1', 'item4'}))
%do sth
else
%do sth
end

请先登录,再进行评论。

类别

Help CenterFile Exchange 中查找有关 Loops and Conditional Statements 的更多信息

标签

产品

Community Treasure Hunt

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

Start Hunting!

Translated by