if loop on array

Question

ali hassan 2022-2-7

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1644540-if-loop-on-array

评论： Image Analyst 2022-2-11

i want to use if loop on a array. let say if i have two arrays:

a=[1 2 3 4 5] 
b=[2 3 4 5 6]

now if i want to use if loop such that when any value in array 'a' is 3 and corresponding value in array 'b' is 4,it should print 'ali'.

i tried the following code but it did'nt work.

a=[3 4 3 44 3];
b=[4 3 4 34 26];
    if (any(a==3) & b==4)   
        sprintf('ali')
    end

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Image Analyst 2022-2-10

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1644540-if-loop-on-array#answer_893165

在 MATLAB Online 中打开

Your parentheses are not right. Try it this way

a=[3 4 3 44 3];
b=[4 3 4 34 26];
if any(a==3 & b==4)   
    fprintf('ali\n')
end
ali
A=[1 2 5 66 7];
B=[6 4 4 77 8];
% if any element in array A is 5 and the corresponding B element is between 2 and 6
if any(A==5 & B>=2 & B<=6)   
    fprintf('ali')
else
    fprintf('No Matches.\n')
end
ali

5 个评论
显示 3更早的评论隐藏 3更早的评论

ali hassan 2022-2-11

here we have a vector column 'FF_liter_ho_'.If i want to know that how many times non zero values were greater than 770 in a row.

so it happened only once in the column.

Image Analyst 2022-2-11

在 MATLAB Online 中打开

@ali hassan if you have the Image Processing Toolbox, you can use regionprops():

ff_liter_ho = [nan, 75, 0, nan, nan, nan, nan, nan, nan, nan, 75, 37, nan, 0, 1, 2, 3, 4]
ff_liter_ho = 1×18
   NaN    75     0   NaN   NaN   NaN   NaN   NaN   NaN   NaN    75    37   NaN     0     1     2     3     4
nonZeroIndexes = ff_liter_ho > 0
nonZeroIndexes = 1×18 logical array
   0   1   0   0   0   0   0   0   0   0   1   1   0   0   1   1   1   1
props = regionprops(nonZeroIndexes, 'Area');
numRuns = length(props)
numRuns = 3
runLengths = [props.Area]
runLengths = 1×3
     1     2     4

请先登录，再进行评论。

Answer 2

KSSV 2022-2-7

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1644540-if-loop-on-array#answer_890440

在 MATLAB Online 中打开

a=[3 4 3 44 3];
b=[4 3 4 34 26];
if (any(a==3))
    idx = a == 3 ;
    if any(b(idx) == 4 )
        fprintf('ali\n')
    end
end

4 个评论
显示 2更早的评论隐藏 2更早的评论

ali hassan 2022-2-10

assume, i have an array

A=[1 2 5 66 7] and B=[6 4 4 77 8]

i want to put if condition such that if any element in array A is 5 and the corresponding is between 2 and 6, i want to know how many times the condition meets.

ali hassan 2022-2-10