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adding breadcrumbs to tutorials
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‎content/tutorials/text/2darray/index.mdx‎

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---
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slug: '/tutorials/2darray'
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title: 'Two-Dimensional Arrays'
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author: 'Daniel Shiffman'
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intro: 'Store and acess data in a matrix using a two-dimensional array.'
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level: 'Intermediate'
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slug: "/tutorials/2darray"
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title: "Two-Dimensional Arrays"
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author: "Daniel Shiffman"
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intro: "Store and acess data in a matrix using a two-dimensional array."
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level: "Intermediate"
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coverImage: 2darray.jpg
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---
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<Note>
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This tutorial is from the book [Learning Processing](https://processing.org/books/#shiffman) by Daniel Shiffman, published by Morgan Kaufmann, © 2008 Elsevier Inc. All rights reserved. If you see any errors or have comments, [please let us know](https://github.com/processing/processing-docs/issues?q=is%3Aopen).
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This tutorial is from the book [Learning Processing](https://processing.org/books/#shiffman) by Daniel Shiffman, published by Morgan Kaufmann, © 2008 Elsevier Inc. All rights reserved. If you see any errors or have comments, [please let us know](https://github.com/processing/processing-website/issues?q=is%3Aopen).
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</Note>
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An [array](http://www.processing.org/reference/Array.html) keeps track of multiple pieces of information in linear order, a one-dimensional list. However, the data associated with certain systems (a digital image, a board game, etc.) lives in two dimensions. To visualize this data, we need a multi-dimensional data structure, that is, a multi-dimensional array. A two-dimensional array is really nothing more than an array of arrays (a three-dimensional array is an array of arrays of arrays). Think of your dinner. You could have a one-dimensional list of everything you eat:
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An [array](http://www.processing.org/reference/Array.html) keeps track of multiple pieces of information in linear order, a one-dimensional list. However, the data associated with certain systems (a digital image, a board game, etc.) lives in two dimensions. To visualize this data, we need a multi-dimensional data structure, that is, a multi-dimensional array. A two-dimensional array is really nothing more than an array of arrays (a three-dimensional array is an array of arrays of arrays). Think of your dinner. You could have a one-dimensional list of everything you eat:
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`(lettuce, tomatoes, steak, mashed potatoes, cake, ice cream)`
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`(lettuce, tomatoes) and (steak, mashed potatoes) and (cake, ice cream)`
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In the case of an array, our old-fashioned one-dimensional array looks like this:
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```
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int[] myArray = {0,1,2,3};
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```
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{236, 189, 189, 80} };
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```
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To walk through every element of a one-dimensional array, we use a for loop, that is:
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To walk through every element of a one-dimensional array, we use a for loop, that is:
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```
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int[] myArray = new int[10];
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int rows = 10;
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int[][] myArray = new int[cols][rows];
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// Two nested loops allow us to visit every spot in a 2D array.
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// Two nested loops allow us to visit every spot in a 2D array.
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// For every column I, visit every row J.
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for (int i = 0; i < cols; i++) {
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for (int j = 0; j < rows; j++) {
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}
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```
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A two-dimensional array can also be used to store objects, which is especially convenient for programming sketches that involve some sort of "grid" or "board." The following example displays a grid of Cell objects stored in a two-dimensional array. Each cell is a rectangle whose brightness oscillates from 0-255 with a sine function.
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A two-dimensional array can also be used to store objects, which is especially convenient for programming sketches that involve some sort of "grid" or "board." The following example displays a grid of Cell objects stored in a two-dimensional array. Each cell is a rectangle whose brightness oscillates from 0-255 with a sine function.
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<FixedImage side width={200} >
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void draw() {
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background(0);
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// The counter variables i and j are also the column and row numbers and
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// are used as arguments to the constructor for each object in the grid.
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// The counter variables i and j are also the column and row numbers and
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// are used as arguments to the constructor for each object in the grid.
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for (int i = 0; i < cols; i++) {
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for (int j = 0; j < rows; j++) {
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// Oscillate and display each object
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// A Cell object
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class Cell {
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// A cell object knows about its location in the grid
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// A cell object knows about its location in the grid
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// as well as its size with the variables x,y,w,h
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float x,y; // x,y location
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float w,h; // width and height
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w = tempW;
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h = tempH;
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angle = tempAngle;
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}
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}
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// Oscillation means increase angle
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void oscillate() {
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angle += 0.02;
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angle += 0.02;
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}
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void display() {
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stroke(255);
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// Color calculated using sine wave
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fill(127+127*sin(angle));
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rect(x,y,w,h);
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rect(x,y,w,h);
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}
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}
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```
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‎content/tutorials/text/color/index.mdx‎

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<Note>
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This tutorial is from the book [Learning Processing](https://processing.org/books/#shiffman) by Daniel Shiffman, published by Morgan Kaufmann, © 2008 Elsevier Inc. All rights reserved. If you see any errors or have comments, [please let us know](https://github.com/processing/processing-docs/issues?q=is%3Aopen).
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This tutorial is from the book [Learning Processing](https://processing.org/books/#shiffman) by Daniel Shiffman, published by Morgan Kaufmann, © 2008 Elsevier Inc. All rights reserved. If you see any errors or have comments, [please let us know](https://github.com/processing/processing-website/issues?q=is%3Aopen).
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</Note>
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‎content/tutorials/text/data/index.mdx‎

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This tutorial is from the book [Learning Processing, 2nd Edition](https://processing.org/books/#shiffman) by Daniel Shiffman, published by Morgan Kaufmann, © 2015 Elsevier Inc. All rights reserved. If you see any errors or have comments, [please let us know](https://github.com/processing/processing-docs/issues?q=is%3Aopen).
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This tutorial is from the book [Learning Processing, 2nd Edition](https://processing.org/books/#shiffman) by Daniel Shiffman, published by Morgan Kaufmann, © 2015 Elsevier Inc. All rights reserved. If you see any errors or have comments, [please let us know](https://github.com/processing/processing-website/issues?q=is%3Aopen).
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‎content/tutorials/text/electronics/index.mdx‎

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This tutorial is &ldquo;Extension 5&rdquo; from [Processing: A Programming Handbook for Visual Designers and Artists, Second Edition](../../handbook), published by MIT Press. &copy; 2014 MIT Press. If you see any errors or have comments, [please let us know](https://github.com/processing/processing-docs/issues?q=is%3Aopen).
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This tutorial is &ldquo;Extension 5&rdquo; from [Processing: A Programming Handbook for Visual Designers and Artists, Second Edition](../../handbook), published by MIT Press. &copy; 2014 MIT Press. If you see any errors or have comments, [please let us know](https://github.com/processing/processing-website/issues?q=is%3Aopen).
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‎content/tutorials/text/network/index.mdx‎

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<Note>
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This tutorial is &ldquo;Extension 2&rdquo; from [Processing: A Programming Handbook for Visual Designers and Artists, Second Edition](../../handbook), published by MIT Press. &copy; 2014 MIT Press. If you see any errors or have comments, [please let us know](https://github.com/processing/processing-docs/issues?q=is%3Aopen).
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This tutorial is &ldquo;Extension 2&rdquo; from [Processing: A Programming Handbook for Visual Designers and Artists, Second Edition](../../handbook), published by MIT Press. &copy; 2014 MIT Press. If you see any errors or have comments, [please let us know](https://github.com/processing/processing-website/issues?q=is%3Aopen).
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‎content/tutorials/text/objects/index.mdx‎

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<Note>
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This tutorial is from the book [Learning Processing](https://processing.org/books/#shiffman) by Daniel Shiffman, published by Morgan Kaufmann, © 2008 Elsevier Inc. All rights reserved. If you see any errors or have comments, [please let us know](https://github.com/processing/processing-docs/issues?q=is%3Aopen).
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This tutorial is from the book [Learning Processing](https://processing.org/books/#shiffman) by Daniel Shiffman, published by Morgan Kaufmann, © 2008 Elsevier Inc. All rights reserved. If you see any errors or have comments, [please let us know](https://github.com/processing/processing-website/issues?q=is%3Aopen).
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‎content/tutorials/text/pixels/index.mdx‎

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This tutorial is from the book [Learning Processing](https://processing.org/books/#shiffman) by Daniel Shiffman, published by Morgan Kaufmann, © 2008 Elsevier Inc. All rights reserved. If you see any errors or have comments, [please let us know](https://github.com/processing/processing-docs/issues?q=is%3Aopen).
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This tutorial is from the book [Learning Processing](https://processing.org/books/#shiffman) by Daniel Shiffman, published by Morgan Kaufmann, © 2008 Elsevier Inc. All rights reserved. If you see any errors or have comments, [please let us know](https://github.com/processing/processing-website/issues?q=is%3Aopen).
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‎content/tutorials/text/print/index.mdx‎

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This tutorial is &ldquo;Extension 4&rdquo; from [Processing: A Programming Handbook for Visual Designers and Artists, Second Edition](../../handbook), published by MIT Press. &copy; 2014 MIT Press. If you see any errors or have comments, [please let us know](https://github.com/processing/processing-docs/issues?q=is%3Aopen).
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This tutorial is &ldquo;Extension 4&rdquo; from [Processing: A Programming Handbook for Visual Designers and Artists, Second Edition](../../handbook), published by MIT Press. &copy; 2014 MIT Press. If you see any errors or have comments, [please let us know](https://github.com/processing/processing-website/issues?q=is%3Aopen).
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‎content/tutorials/text/pshape/index.mdx‎

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If you see any errors in this tutorial or have comments, [please let us know](https://github.com/processing/processing-docs/issues?q=is%3Aopen). This work is licensed under a [Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License](http://creativecommons.org/licenses/by-nc-sa/4.0/).
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If you see any errors in this tutorial or have comments, [please let us know](https://github.com/processing/processing-website/issues?q=is%3Aopen). This work is licensed under a [Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License](http://creativecommons.org/licenses/by-nc-sa/4.0/).
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‎content/tutorials/text/sound/index.mdx‎

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This tutorial is &ldquo;Extension 3&rdquo; from [Processing: A Programming Handbook for Visual Designers and Artists, Second Edition](../../handbook), published by MIT Press. &copy; 2014 MIT Press. If you see any errors or have comments, [please let us know](https://github.com/processing/processing-docs/issues?q=is%3Aopen).
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This tutorial is &ldquo;Extension 3&rdquo; from [Processing: A Programming Handbook for Visual Designers and Artists, Second Edition](../../handbook), published by MIT Press. &copy; 2014 MIT Press. If you see any errors or have comments, [please let us know](https://github.com/processing/processing-website/issues?q=is%3Aopen).
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