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MS Excel and Matlab (interchanging

data)

In this article we'll show how to

interchange information

between MS Excel andMathworks' Matlab, working

from a Matlab m-file.

There are two handy Matlab

instructions for this purpose:

xlsread and xlswrite.

Common format for xlsread (read an xls-file):

[num, txt] = xlsread(file, sheet, range)

Wherefile = name of xls file (string)

sheet = name of specific sheet within the file (string)

range = specific range to read (string)

num = read numerical data (numeric array or matrix)

txt = read text data (cell array)

Common format for xlswrite (to write an xls.file):

xlswrite(file, m, sheet, range)

Where

m = matrix to insert in xls file

file, sheet and range are as before

An example...

Let's say that we have an Excel file named 'ex2mat.xls' that includes two

sheets named 'Days' and 'Months'.

Here's the data for those sheets:

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We start by setting-up our environment (we assume that the MS Excel .xls file

is in the same directory as our Matlab files, otherwise we should take care of

the full path for the file under test):

file = 'ex2mat.xls';

sheet1 = 'Days';

sheet2 = 'Months';

We read relevant information:

[numbers, text] = xlsread(file, sheet1, 'a1:c8')

And we get:

numbers =

1.0e+004 *

0.5538 0.0381

0.5504 0.0371

0.5480 -1.7382

2.3209 -0.8941

3.2497 3.1644

0.1200 -1.0851

1.2398 1.2745

text =

'Day' 'Value 1 ' 'Value 2'

'Monday' '' ''

'Tuesday' '' ''

'Wednesday' '' ''

'Thursday' '' ''

'Friday' '' ''

'Saturday' '' ''

'Sunday' '' ''

Note that 'text' is a cell array, without numbers.

We can manipulate data and insert the results back in the file (the file must beclosed in advance, otherwise Matlab won't update it):

m = mean(numbers)

xlswrite(file, m, sheet1,'b9:c9')

[numbers, text] = xlsread(file, sheet1, 'a5:c5')

m = m + numbers;

xlswrite(file, m, sheet1, 'b10:c10')

The final result is:

We can read the other sheet from the file, like this:

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[n1, txt1] = xlsread(file, sheet2, 'a1:c13')

[n2, txt2] = xlsread(file, sheet2, 'a2:c2')

And the results are:

n1 =

1.0e+004 *

2.5000 2.3723

2.6000 2.4723

2.6500 2.5223

2.2002 2.0725

3.4098 3.2821

4.9854 4.85770.2454 0.1177

2.3111 2.1834

2.2311 2.1034

6.5471 6.4194

2.3841 2.2564

2.3999 2.2722

txt1 =

'Month' 'Value 1 ' 'Value 2'

'January' '' ''

'February' '' ''

'March' '' ''

'April' '' ''

'May' '' ''

'June' '' ''

'July' '' ''

'August' '' ''

'September' '' ''

'October' '' ''

'November' '' ''

'December' '' ''

n2 =

25000 23723

txt2 =

'January'

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