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Problem 7.12c involves creating a currency conversion chart between U.S. dollars, British pounds, Japanese yen, and euros, and saving it in a file named `"Dollars_Conversions.dat"`. Here’s a breakdown of the solution steps in MATLAB:

1. **Define Exchange Rates:**
   - Conversion rates are:
     - **Pounds per dollar**: 0.83065
     - **Yen per dollar**: 134.81137
     - **Euros per dollar**: 0.94289

2. **Generate Dollar Values Array:**
   - Create an array `dollars` with 29 values linearly spaced from 1 to 15.

3. **Compute Conversion Arrays:**
   - Calculate the corresponding values for each currency:
     - `pounds = dollars * 0.83065`
     - `yen = dollars * 134.81137`
     - `euros = dollars * 0.94289`

4. **Combine Data into a Matrix:**
   - Group `dollars`, `pounds`, `yen`, and `euros` into a `4x29` matrix called `conversions`.

5. **Output Formatting and File Writing:**
   - Use `fprintf` to format and write data to `"Dollars_Conversions.dat"`.
   - Use:
     - **8 spaces for dollars** with no decimal points.
     - **10 spaces with 4 decimal points** for other currencies.
   - Add a tab between each column.

Here’s an example MATLAB code outline for the solution:

```matlab
% Define conversion rates
pounds_rate = 0.83065;
yen_rate = 134.81137;
euro_rate = 0.94289;

% Create array of dollar values from 1 to 15 with 29 entries
dollars = linspace(1, 15, 29);

% Calculate converted currency arrays
pounds = dollars * pounds_rate;
yen = dollars * yen_rate;
euros = dollars * euro_rate;

% Group into a matrix with each currency type on its own row
conversions = [dollars; pounds; yen; euros];

% Open file for writing
fileID = fopen('Dollars_Conversions.dat', 'w');

% Print the headers
fprintf(fileID, 'Dollars\tPounds\t\tYen\t\tEuros\n');

% Print each row of data with specified formatting
for i = 1:length(dollars)
    fprintf(fileID, '%8.0f\t%10.4f\t%10.4f\t%10.4f\n', ...
        dollars(i), pounds(i), yen(i), euros(i));
end

% Close the file
fclose(fileID);
```

Would you like additional details on any part of the code?

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**Related Questions:**
1. How can you verify the contents of the file are correctly formatted?
2. What function is used to read back the table from a `.dat` file in MATLAB?
3. How does `fprintf` differ from `disp` when outputting to a file?
4. What are some common issues with file formatting in MATLAB?
5. How could this code be modified to output additional currency conversions?

**Tip:** Remember to test code outputs by reading the file afterward to ensure formatting matches requirements.

Create a conversion chart between U.S. dollars, British pounds, Japanese yen, and euros, and save it in a file named "Dollars_Conversions.dat".

Learn how to create a currency conversion chart between U.S. dollars, British pounds, Japanese yen, and euros using MATLAB. This step-by-step guide includes detailed MATLAB code to format and save the conversion data into a .dat file. Core concepts covered include linear arrays, currency conversion formulas, and precise file formatting using the fprintf command.

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