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Imported Excel strings are not functioning correctly in matlab 2012b

Asked by Michael on 19 Nov 2012

I have used xlsread to read in a spreadsheet containing text and numbers. I am trying to use the text to set up a structure system and noticed that the strings read from excel do not resolve the same way strings entered in matlab do. For instance, if I use

structure.('NAME1').('NAME2') = 1;

it correctly generates the structure. However, if I have

[~,names,~] = xlsread(file,sheet,corners);
structure.(names(1,1)).(names(1,2)) = 1;

I get an error saying:

Argument to dynamic structure reference must evaluate to a valid field name.

I've noticed that names(1,1) returns 'NAME1' but the string does not appear in blue in the command window the way it does if I just type 'NAME1'. What is going on here? Is it the difference between an apostrophe and a single quote?

I have similar trouble with cells imported from excel when trying to create vectors with them. Rather than just creating one vector with all the data in it it creates a cell structure with independent cells for the data. What amd I missing about the way matlab reads data from Excel?

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Michael

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Answer by owr on 19 Nov 2012

Just a guess, but "names" is probably a cell array, so names(1,1) and names(1,2) are 1x1 cell arrays. You need to get access to the character strings within.

Try this instead:

structure.(names{1,1}).(names{1,2}) = 1;

If this is it, spend a little time reading up on the difference of using "(...)" indexing and "{...}" indexing of cell arrays in ML.

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owr

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