# Arrays - Introduction - PowerPoint PPT Presentation

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Arrays - Introduction. What are arrays? When are they used/useful?. Many examples. Definition: ARRAYS. What? ONE variable that contains MORE THAN ONE value. VECTORS ( 1 D). MATRICES ( 2 D, 3 D.. ). pressures. velocity. densities. temperatures. When to use arrays.

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Arrays - Introduction

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## Arrays - Introduction

What are arrays?

When are they used/useful?

Many examples

### Definition: ARRAYS

• What?

• ONE variable that contains MORE THAN ONE value.

VECTORS (1D)

MATRICES (2D,3D..)

pressures

velocity

densities

temperatures

### When to use arrays

• Data Base (Keep data together)

### Examples

Database

“VECTORS”

Keep the top 5 scores:

Keep the part numbers of a specific Gas Engine:

### When to use arrays

• Keep data together (data base)

• Create data tables (financial analysis…)

### Example

Data Tables

“MATRIX”

Financial: Loan Analysis

### When to use arrays

• Keep data together (data base)

• Create data tables (multiplication, sine, cosine, financial analysis…)

• Study properties of fluids (CFD)

### CFD

Shock Waves

Aerodynamics

CFD = Computational Fluid Dynamics

->Solve and analyze problems that involve fluid flows

Shock Waves

### CFD

Shock Waves

Aerodynamics

Matrices: Grids or Mesh

T : temperature

P : pressure

u : velocity

: density

Fluid Flow

### CFD

Shock Waves

Aerodynamics

Matrices: Grids or Mesh

1st layer : T

2nd layer: P

3rd layer:

4th layer: u

Fluid Flow

Or.. 1 unique 3Dimensional array !!!

### When to use arrays

• Keep data together (data base)

• Create data tables (multiplication, sine, cosine, financial analysis…)

• Study properties of fluids (CFD)

• Upload tremendous amount of data from files

Files

### When to use arrays

• Keep data together (data base)

• Create data tables (multiplication, sine, cosine, financial analysis…)

• Study properties of fluids (CFD)

• Upload tremendous amount of data from files

Etc…

### Lessons Learned

• What is an array?

• Difference between “vector” and “matrix”

• Various examples showing the big pictures of arrays

• What’s next? Creating arrays using MATLAB!