how to count number of elements greater than ?

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menna gamal 2015-4-4

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评论： Image Analyst 2019-12-1

i'am new in matlab i want to the ways to count the number of formfactor in this code is greater than (e.g. 0.8)then this is normal Cell for example and print the number of normal and the number(abnormal) it is between (0.31-0.5)

 hold on;
 S =regionprops(Label,'area','perimeter');
 for i=1:num
    x(i)=S(i).Area; 
    y(i)=S(i).Perimeter;
    %Form factor=4* pi * area/ (perimeter* perimeter) 
    form(i)=4.*pi.*x(i)./(y(i).^2);
 end

i think to make array and if statement which save the true from if statement in array , and i try to make this :

 NormalCount=sum(form(i)==1 || form(i)>=0.8);
 AbnormalCount=sum(form(i)<0.8);
 message1 = sprintf('Number of normal cells: %d %d',NormalCount);
 message2 = sprintf('Number of Abnormal cells: %d %d',AbnormalCount);
 msgbox({message1,message2});

But the result from this is wrong and i don't know this in for loop or i put it put ?

thanks.

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回答（1 个）

Geoff Hayes 2015-4-4

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https://ww2.mathworks.cn/matlabcentral/answers/196070-how-to-count-number-of-elements-greater-than#answer_173921

编辑：Geoff Hayes 2015-4-4

在 MATLAB Online 中打开

Menna - rather than using find just use the greater than operator to determine which elements of form are greater than 0.8 and then sum the result. Note that

form>0.8

will return an array of 0s and 1s where each zero indicates that the element in form at the index where the zero appears is not greater than 0.8, and each one indicates that the element in form at the index where the one appears is greater than 0.8.

For example, if

form = [0.1 0.9 0.83 0.33 0.22 0.44 0.99];

then

form>0.8

returns

0 1 1 0 0 0 1

as expected. Then just sum the result as

NormalCount = sum(form>0.8);

For your abnormal count, just do

AbnormalCount = sum(form>=0.31 & form<=0.5);