# istriu

Checks if matrix is upper triangular.

## 📝 Syntaxe

* tf = istriu(M)

## 📥 Argument d'entrée

* M - a numeric array

## 📤 Argument de sortie

* tf - logical: result of 'istriu'.

## 📄 Description

istriu returns an scalar logical if entry is upper triangular.

## 💡 Exemple

```matlab
A = eye(3, 3);
R = istriu(A)
R = istriu(A(:,1))
```

## 🔗 Voir aussi

[isdiag](https://nelson-9.gitbook.io/nelson/markdown/fr/elementary_functions/isdiag), [istril](https://nelson-9.gitbook.io/nelson/markdown/fr/elementary_functions/istril).

## 🕔 Historique

| Version | 📄 Description   |
| ------- | ---------------- |
| 1.0.0   | version initiale |
