Counting the occurrence of a value=Inf in an array
18 ビュー (過去 30 日間)
古いコメントを表示
I am given a vector for instance
R=[1;2;3;4;5;6 Inf; 7; Inf];
Is there a function in matlab which has inputs R and Inf and gives me back the number of occurrence of Inf in R?
0 件のコメント
回答 (1 件)
Paras Gupta
2022 年 7 月 6 日
Hi,
It is my understanding that you need a function to find the total number of 'Inf' values in a given array. Though there does not seem to be any one particular function to find the same, you can very easily find the solution using two functions as is illustrated in the following code.
R = [1; 2; 3; 4; 5; 6; Inf; 7; Inf];
% isinf returns a logical array with true (1) at indices where element is inf
% nnz returns the number of non-zero values in the array
infCount1 = nnz(isinf(R))
% one could also use sum function instead of nnz
infCount2 = sum(isinf(R))
You can refer to the following documentations on isinf, nnz, and sum for more information on how the above code works.
Hope it helps!
1 件のコメント
Steven Lord
2022 年 7 月 6 日
isinf may or may not be the right tool, depending on whether the user wants all infinite values in the array to be counted or just the positive ones.
% Sample data: Inf for multiples of 3, -Inf for multiples of 5, NaN for both
x = (1:15).';
x(3:3:end) = Inf;
x(5:5:end) = -Inf;
x(15) = NaN;
allInf = isinf(x);
justPositive = x == Inf;
nonfinites = ~isfinite(x);
results = table(x, allInf, justPositive, nonfinites)
参考
カテゴリ
Help Center および File Exchange で Loops and Conditional Statements についてさらに検索
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!