I have a function but I cannot deal with the variable named data when I call the function. If I run the code alone (without calling the function, it works).

Please find the actual code below:

```
function data = returns_ext(input);
clear all
clc
ticker = 'BA';
filename = ['C:\Users\FP\Documents\MatlabCode\P\prices\' ticker 'daily.csv'];
newData1 = importdata(filename);
% Create new variables in the base workspace from those fields.
vars = fieldnames(newData1);
for i = 1:length(vars)
assignin('base', vars{i}, newData1.(vars{i}));
end
prices_data = data;
```

ERROR: At compilation, "data" was determined to be a variable and this variable is uninitialized. "data" is also a function name and previous versions of MATLAB would have called the function. However, MATLAB 7 forbids the use of the same name in the same context as both a function and a variable.

```
Error in ==> returns_ext at 17
prices_data = data;
```

Answer:

You should replace `assignin`

by eval, since `assignin`

assigns either in the caller function calling `returns_ext`

or the base workspace. See the simple example below:

```
function test
newData1.prices = 1;
newData1.dates = 2;
variables = {'prices','dates'};
for i = 1:length(variables)
temp = newData1.(variables{i});
eval([variables{i} ' = temp;']);
end
disp(prices)
disp(dates)
```

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