Error Operands to the || and && operators must be convertible to logical scalar values.

Question

Armindo 2019-2-7

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/443671-error-operands-to-the-and-operators-must-be-convertible-to-logical-scalar-values

编辑： Armindo 2019-2-7

采纳的回答： Walter Roberson

Names = {'RHip','RKnee','RAnkle'};

Why doing this works ok

if~isempty( strfind(Names{1}, 'Hip') || strfind(Names{2}, 'Knee'))

if~isempty( strfind(Names{1}, 'Hip') || strfind(Names{3}, 'Knee'))

but doing this gives the error Operands to the || and && operators must be convertible to logical scalar values.

if~isempty( strfind(Names{3}, 'Hip') || strfind(Names{2}, 'Knee'))

Note in code was missing the ~isempty (i already added it). Nevertheless this dont change the outcome. The problem is that when the first operation give an [ ] the outcome is an error

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Answer 1

Walter Roberson 2019-2-7

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/443671-error-operands-to-the-and-operators-must-be-convertible-to-logical-scalar-values#answer_359901

strfind can return empty and you cannot use && or || with empty .

strfind finds all occurrences and returns their index . It is not intended to directly answer the question of whether to pattern occurs somewhere Yes or No. With new enough MATLAB use contains()