jcbritobr / matlab

golang matlab level 5 reader / writer library

Matlab

Apparently a parser for matlab 5.0 doesn't exist in go. So, here we are.

The matlab format can be found in this pdf.

This is still very much a work in progress!

Example usage

package main

import (
	"fmt"
	"os"

	"github.com/daniellowtw/matlab"
)

func main() {
	f, err := os.Open("example.mat")
	if err != nil {
		panic(err)
	}
	defer f.Close()
	file, err := matlab.NewFileFromReader(f)
	if err != nil {
		panic(err)
	}
	fmt.Println(file.GetVarsNames()) // prints the variables in the mat file
	matrix, _ := file.GetVar("a")
	// convenient method to marshal into go types
	var _ []int64 = matrix.IntArray()
	floatMatrix, _ := file.GetVar("b")
	// convenient method to marshal into go types
	var _ []float64 = floatMatrix.DoubleArray()
}

Matrix with cells

A CellMatrix is a matrix where the values are matrices. The GetAtLocation method allows indexing into the values array. A convenience method String() on a Matrix is available to convert the CharArray matrix into a string.

Example:

cellMatrix, _ := file.GetVar("a")
firstElement := cellMatrix.GetAtLocation(0).(*Matrix).String()
SecondElement := cellMatrix.GetAtLocation(1).(*Matrix).DoubleArray()

Matrix with struct

Suppose we create a struct with the following:

X.w = [1];
# or X.w = 1

X.y = [2];
X.z = ["abc"];
# or X.z = "abc"

We can read it as follows:

structMatrix, _ := file.GetVar("X")
w := cellMatrix.Struct()["w"].GetAtLocation(0) // float64(1)
z := cellMatrix.Struct()["z"].String() // "abc"

TODO

• Support sparse array class within miMatrix parser
• Support object class within miMatrix parser
• Support writing to mat file