How do I record the location of a specific value in a set of data?

Question

Madison Castellanos 2020-6-17

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/549672-how-do-i-record-the-location-of-a-specific-value-in-a-set-of-data

评论： Madison Castellanos 2020-6-18

采纳的回答： madhan ravi

Hello,

I am very new to matlab, and would appreciate advice!

I understand my question is not entirely clear. So I am trying to go through data that looks like:

[1] 0 0 0 0 1 0 1 0 0

And want the code to index until it encounters the first 1 (ignoring the rest of the 1s repeated in the row) then state the distance from the start of the row to the first 1 [so here it would be the distance from column 5 to column 1]

Then ideally it would repeat the same thing for a second row. My 'for' loop is not working, and ideally this code would work for dozens of rows of data. Thank you :)

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

madhan ravi 2020-6-17

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/549672-how-do-i-record-the-location-of-a-specific-value-in-a-set-of-data#answer_452376

在 MATLAB Online 中打开

First_1 = find(x,1) % where x is your row in the loop 
Distance = diff(find(x,2))

3 个评论
显示 1更早的评论隐藏 1更早的评论

madhan ravi 2020-6-18

That is why I specifically commented saying “row” which is “singular”. Loop through through the rows. Preallocate distance as a cell.

Madison Castellanos 2020-6-18

here is my attempt

x=1; %represents number of rows

Distance=cell(3,1); %preallocating distance as an empty cell

for x=1:3 %since only 3 rows in 'exp'

First_1 = find(exp,x); % where x is your row in the loop

if First_1 < 7 %(for 7 columns, but I know this isn't right)

x=x+1

Distance = diff(find(exp,2))

end

So I know this code is not correct, but I am still encountering the same error as earlier. Any insight would be appreciated

请先登录，再进行评论。

Answer 2

Vladimir Sovkov 2020-6-17

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/549672-how-do-i-record-the-location-of-a-specific-value-in-a-set-of-data#answer_452370

在 MATLAB Online 中打开

a=[0 0 0 0 1 0 1 0 0];
k=find(a==1,1)

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Madison Castellanos 2020-6-17

thank you :)

请先登录，再进行评论。