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

cl=input('Enter class ( up-1 or down-2 or blink-3): ');
if cl==1
    [k,~]=find((all_peak(:,2)>0)&&((all_peak(:,2)<p1_peak(:,2))))
% %     [k,~]=find(all_peak(:,2)<0);
    ch_n='up';
elseif cl==2
    [k,~]=find(all_peak(:,2)<0);
% %     [k,~]=find((all_peak(:,2)>0)&&((all_peak(:,2)<allnew_peak(;,2)));
    ch_n='down';
else
     [k,~]=find(all_peak(:,2)>0);
    ch_n='blink';
end

where all_peak =[16,2] matrix , p1_peak =[12,2 ] matrix , allnew_peak=[12,2] matrix. i am getting error. Operands to the || and && operators must be convertible to logical scalar values. how to solve it ?

[Walter Roberson]

all_peak(:,2)<p1_peak(:,2)

what is the intended meaning of that when all_peak is 16 x 2 and p1_peak is 12 x 2 ? How do you want 16 items to be compared to 12 items?

[arunnagiri murrugesan]

lets take all_peak [16,2] = 1542 15.56 p1_peak[12,2] = 1243 13.06

1342 -21.43 1453 24.54

i want to compare 15.56 with 13.06 , -21.43 with 24.54

[Walter Roberson]

Okay, so when you get to all_peak(13,2) then what should it be compared to in p1_peak ?

Answer 1

[Fabio Freschi]

If you work with arrays, use the single & and not &&

[arunnagiri murrugesan]

Matrix dimensions must agree. i am getting popped with this error when i use single &

[Fabio Freschi]

So you are comparing arrays of different dimensions. Look at Walter’s comment