ENGR/MATH/PHYS-25
HomeWork 04 • Data Importation
Problem-1
1. Go To the ENGR25 WebPage and locate the MSExcel SpreadSheet File ENGR25_HW04_AREA90_Data.xlsx
2. Load the Spreadsheet file onto your MATLAB-Capable Computer
3. Import the spreadsheet file into MATLAB
4. Use MATLAB to calculate the MEAN, or average, value for each COLUMN
Problem-2
1. Go To the ENGR25 WebPage and locate the Comma Separated Value Data-File
ENGR25_HW_ScopeMeter_TP5_0210.csv
2. Load the data file onto your MATLAB-Capable Computer
3. Import the data into MATLAB
 Each Column contains 255 data values
 The Data Column Identification
 Col-1 → Time in seconds
 Col-2 → Electrical Potential (lo) in volts
 Col-3 → Electrical Potential (hi) in volts
4. Take the mean of the corresponding Col-2 and Col-3 row-values to create a column-vector
of average potentials that correspond to each time data-value.
5. Create a Plot of the Average-Potential vs time.
 Properly Label and Title the Plot.
© Bruce Mayer, PE • Chabot College • Document1 • Page 1
Problem-3
1. Go To the ENGR25 WebPage and locate the .txt Data-File
ENGR25_GaTe_Olukoya_HW_1301.txt
2. Load the data file onto your MATLAB-Capable Computer
3. Import the data into MATLAB
 The Data Column Identification
 Col-1 → WaveNumber in WaveLengths per CentiMeter
 Col-2 → Raman Spectroscopic Intensity in Arbitrary Units (A.U.)
4. Create a Plot of the Raman Intensity vs WaveNumber.
 Properly Label and Title the Plot.
Problem-4
1. Go To the MathWorks WebSite and view this instructional video:
http://www.mathworks.com/videos/new-spreadsheet-import-tool-in-r2011b69037.html
2. Go To the ENGR25 WebPage and locate the .xlsx Data-File PR960404_T_vs_x_data.xlsx
3. Import the Data into MATLAB
 The Data Column Identification
 Col-B → Distance in inches
 Col-C → Temperature in °C
4. Calculate the spatial gradient (spatial derivative) using the MATLAB Code Fragment shown
Below
5. Create a Plot of dT/dx vs x
 Properly Label and Title the Plot.
diffT = diff(TempTC);
diffx = diff(Distancexin);
dTdx = diffT./diffx;
plot(Distancexin(2:573),dTdx, 'LineWidth', 2)
Figure 1 • Code Fragment for Use with Problem-4
© Bruce Mayer, PE • Chabot College • Document1 • Page 2