read Float32Array from file

Posted on Mon 15th, June 2015

• #1

JumJum

Is there a better way to read data from a file into Float32Array than this ?

var f = E.openFile("myTestF.idx","r");
f.skip(4);
var b = new Float32Array(E.toUint8Array(f.read(4)).buffer);
var c = new Float32Array(E.toUint8Array(f.read(8)).buffer);
f.close();

• #2

Gordon
Do you know the length?

What you're doing is fine, but I'd be tempted to just read the whole thing (or at least big chunks) into memory and use views to read it directly:
```
var f = E.openFile("myTestF.idx","r");
var bytes = E.toUint8Array(f.read(16));
var floats = new Float32Array(bytes.buffer);
f.close();
```
By using .buffer you're not actually allocating any more memory - the two arrays are sharing the same data.

Post a reply
- Bold
- Italics
- Link
- Image
- List
- Quote
- code
- Preview
Formatting Help

Don't worry about formatting, just type in the text and we'll take care of making sense of it. We will auto-convert links, and if you put asterisks around words we will make them bold.

Tips:

Create headers by underlining text with ==== or ----

To *italicise* text put one asterisk each side of the word

To **bold** text put two asterisks each side of the word

Embed images by entering:
![](https://www.google.co.uk/images/srpr/logo4w.png)
That's the hard one: exclamation, square brackets and then the URL to the image in brackets.

* Create lists by starting lines with asterisks

1. Create numbered lists by starting lines with a number and a dot

> Quote text by starting lines with >

Mention another user by @username

For syntax highlighting, surround the code block with three backticks:

```
Your code goes here
```
Just like Github, a blank line must precede a code block.

If you upload more than 5 files we will display all attachments as thumbnails.

For a full reference visit the Markdown syntax.

read Float32Array from file

About

read Float32Array from file

Actions

read Float32Array from file

Formatting Help

About

read Float32Array from file

Actions

Espruino