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This tutorial demonstrates how to use the example codes in the wn_matrix distribution src/examples directory. The sample input files used in the tutorial are included in the distribution release and may be located in the data_pub directory.
Example 1: Create a matrix, store elements, and scale them.
wn_matrix routines demonstrated in example1.c are:
- Line 36: WnMatrix__new()
- Line 45: WnMatrix__assignElement()
- Line 57: WnMatrix__removeElement()
- Line 80: WnMatrix__getElement()
- Line 89: WnMatrix__getNumberOfElements()
- Line 96: WnMatrix__scaleMatrix()
- Line 130: WnMatrix__clear()
- Line 154: WnMatrix__free()
To run example1, type the following on the command line:
./example1 > ex1_output.txt
The result is ex1_output.txt
Example 2: Print out a matrix to a file.
wn_matrix routines demonstrated in example2.c are:
- Line 55: WnMatrix__new()
- Line 64: WnMatrix__assignElement()
- Line 77: WnMatrix__writeMatrixToAsciiFile()
- Line 86: WnMatrix__free()
To run example2, type the following on the command line:
./example2 2.0 ex2_output.txt
The result is ex2_output.txt
Example 3: Convert a matrix to compressed row format.
wn_matrix routines demonstrated in example3.c are:
- Line 59: WnMatrix__new()
- Line 68: WnMatrix__assignElement()
- Line 80: WnMatrix__getCsr()
- Line 96: WnMatrix__Csr__getRowPointerVector()
- Line 106: WnMatrix__getNumberOfElements()
- Line 114: WnMatrix__Csr__getColumnVector()
- Line 115: WnMatrix__Csr__getValueVector()
- Line 126: WnMatrix__Csr__free()
- Line 132: WnMatrix__getCoo()
- Line 147: WnMatrix__Coo__getRowVector()
- Line 148: WnMatrix__Coo__getColumnVector()
- Line 149: WnMatrix__Coo__getValueVector()
- Line 160: WnMatrix__Coo__free()
- Line 161: WnMatrix__free()
To run example3, type the following on the command line:
./example3 ex3_output.txt
The result is ex3_output.txt
Example 4: Convert a matrix to Yale sparse format.
wn_matrix routines demonstrated in example4.c are:
- Line 56: WnMatrix__new()
- Line 65: WnMatrix__assignElement()
- Line 77: WnMatrix__getYale()
- Line 79: WnMatrix__Yale__getPointerVector()
- Line 80: WnMatrix__Yale__getValueVector()
- Line 93: WnMatrix__getNumberOfRows()
- Line 103: WnMatrix__getNumberOfElements()
- Line 130: WnMatrix__getElement()
- Line 142: WnMatrix__Yale__free()
- Line 143: WnMatrix__free()
To run example4, type the following on the command line:
./example4 ex4_output.txt
The result is ex4_output.txt
Example 5: Insert a smaller matrix into a larger one and extract a smaller matrix from a larger one.
wn_matrix routines demonstrated in example5.c are:
- Line 59: WnMatrix__new()
- Line 74: WnMatrix__assignElement()
- Line 86: WnMatrix__insertMatrix()
- Line 94: WnMatrix__getGslMatrix()
- Line 111: WnMatrix__getElement()
- Line 144: WnMatrix__free()
- Line 150: WnMatrix__extractMatrix()
- Line 161: WnMatrix__getNumberOfRows()
- Line 166: WnMatrix__getNumberOfColumns()
To run example5, type the following on the command line:
./example5 ex5_output.txt
The result is ex5_output.txt
Example 6: Convert ascii coordinate matrix data into XML data and write to a file.
wn_matrix routines demonstrated in example6.c are:
- Line 82: WnMatrix__new()
- Line 91: WnMatrix__assignElement()
- Line 104: WnMatrix__getCoo()
- Line 110: WnMatrix__free()
- Line 116: WnMatrix__Coo__writeToXmlFile()
- Line 122: WnMatrix__Coo__free()
To run example6, type the following on the command line:
./example6 ../../data_pub/matrix.txt ex6_output.xml
The result is ex6_output.xml
Example 7: Print out the data from a matrix in XML format.
wn_matrix routines demonstrated in example7.c are:
- Line 53: WnMatrix__is_valid_input_xml()
- Line 63: WnMatrix__new_from_xml()
- Line 72: WnMatrix__getCoo()
- Line 81: WnMatrix__getNumberOfElements()
- Line 86: WnMatrix__Coo__getRowVector()
- Line 87: WnMatrix__Coo__getColumnVector()
- Line 88: WnMatrix__Coo__getValueVector()
- Line 97: WnMatrix__Coo__free()
- Line 99: WnMatrix__free()
To run example7, type the following on the command line:
./example7 ../../data_pub/matrix.xml > ex7_output.txt
The result is ex7_output.txt
Use an XPath expression to select out particular rows, columns, or values:
./example7 ../../data_pub/matrix.xml "[row < 3 or value > 0]" > ex7_output_xpath.txt
The result is ex7_output_xpath.txt
Example 8: Print out the non-zero elements of a row or column of a matrix.
wn_matrix routines demonstrated in example8.c are:
- Line 58: WnMatrix__new_from_xml()
- Line 76: WnMatrix__getRow()
- Line 81: WnMatrix__getColumn()
- Line 91: WnMatrix__Line__getNonZeroIndices()
- Line 92: WnMatrix__Line__getNonZeroElements()
- Line 94: WnMatrix__Line__getNumberOfElements()
- Line 106: WnMatrix__Line__free()
- Line 107: WnMatrix__free()
To run example8, type the following on the command line:
./example8 ../../data_pub/matrix.xml row 1 > ex8_output.txt
The result is ex8_output.txt
Try other rows or columns. For example, try
./example8 ../../data_pub/matrix.xml column 2 > ex8_output_column.txt
The result is ex8_output_column.txt
Example 9: Get the transfer matrix form of a matrix.
wn_matrix routines demonstrated in example9.c are:
- Line 53: WnMatrix__new_from_xml()
- Line 68: WnMatrix__getTransferMatrix()
- Line 78: WnMatrix__getNumberOfRows()
- Line 82: WnMatrix__getNumberOfColumns()
- Line 89: WnMatrix__getElement()
- Line 102: WnMatrix__free()
To run example9, type the following on the command line:
./example9 ../../data_pub/matrix.xml ex9_output.txt
The result is ex9_output.txt
Example 10: Get a copy of a matrix and the transpose of a matrix.
wn_matrix routines demonstrated in example10.c are:
- Line 54: WnMatrix__new_from_xml()
- Line 69: WnMatrix__getCopy()
- Line 75: WnMatrix__getTranspose()
- Line 85: WnMatrix__getNumberOfRows()
- Line 88: WnMatrix__getNumberOfColumns()
- Line 95: WnMatrix__getElement()
- Line 110: WnMatrix__free()
To run example10, type the following on the command line:
./example10 ../../data_pub/matrix.xml ex10_output.txt
The result is ex10_output.txt
Example 11: Convert ascii vector data into XML data and write to a file.
wn_matrix routines demonstrated in example11.c are:
- Line 101: WnMatrix__write_gsl_vector_to_xml_file()
To run example11, type the following on the command line:
./example11 ../../data_pub/vector.txt ex11_output.xml
The result is ex11_output.xml
Example 12: Print out the data from a vector in XML format.
wn_matrix routines demonstrated in example12.c are:
- Line 51: WnMatrix__is_valid_vector_input_xml()
- Line 61: WnMatrix__new_gsl_vector_from_xml()
To run example12, type the following on the command line:
./example12 ../../data_pub/vector.xml > ex12_output.txt
The result is ex12_output.txt
Use an XPath expression to select out particular elements (here only the elements larger than zero):
./example12 ../../data_pub/vector.xml "[. > 0]" > ex12_output_xpath.txt
The result is ex12_output_xpath.txt
Example 13: Read in coordinate matrix data from an XML file, convert to compressed sparse row format, and output to an XML file.
wn_matrix routines demonstrated in example13.c are:
- Line 53: WnMatrix__is_valid_input_xml()
- Line 62: WnMatrix__new_from_xml()
- Line 68: WnMatrix__getCsr()
- Line 74: WnMatrix__free()
- Line 80: WnMatrix__Csr__writeToXmlFile()
- Line 86: WnMatrix__Csr__free()
To run example13, type the following on the command line:
./example13 ../../data_pub/matrix.xml ex13_csr.xml
The result is ex13_csr.xml
Example 14: Read in coordinate matrix data from an XML file, convert to Yale sparse format, and output to an XML file.
wn_matrix routines demonstrated in example14.c are:
- Line 53: WnMatrix__is_valid_input_xml()
- Line 62: WnMatrix__new_from_xml()
- Line 68: WnMatrix__getYale()
- Line 74: WnMatrix__free()
- Line 80: WnMatrix__Yale__writeToXmlFile()
- Line 86: WnMatrix__Yale__free()
To run example14, type the following on the command line:
./example14 ../../data_pub/matrix.xml ex14_yale.xml
The result is ex14_yale.xml
Example 15: Multiply a matrix by a vector and a transpose matrix by a vector.
wn_matrix routines demonstrated in example15.c are:
- Line 52: WnMatrix__is_valid_input_xml()
- Line 61: WnMatrix__new_from_xml()
- Line 67: WnMatrix__is_valid_vector_input_xml()
- Line 76: WnMatrix__new_gsl_vector_from_xml()
- Line 85: WnMatrix__computeMatrixTimesVector()
- Line 99: WnMatrix__getNumberOfRows()
- Line 105: WnMatrix__getNumberOfColumns()
- Line 114: WnMatrix__getElement()
- Line 149: WnMatrix__computeTransposeMatrixTimesVector()
- Line 206: WnMatrix__free()
To run example15, type the following on the command line:
./example15 ../../data_pub/matrix.xml ../../data_pub/vector.xml > ex15_output.txt
The result is ex15_output.txt
Example 16: Solve a matrix equation.
wn_matrix routines demonstrated in example16.c are:
- Line 50: WnMatrix__is_valid_input_xml()
- Line 59: WnMatrix__new_from_xml()
- Line 65: WnMatrix__is_valid_vector_input_xml()
- Line 74: WnMatrix__new_gsl_vector_from_xml()
- Line 81: WnMatrix__solve()
- Line 95: WnMatrix__getNumberOfRows()
- Line 101: WnMatrix__getNumberOfColumns()
- Line 109: WnMatrix__getElement()
- Line 129: WnMatrix__computeMatrixTimesVector()
- Line 147: WnMatrix__free()
To run example16, type the following on the command line:
./example16 ../../data_pub/matrix.xml ../../data_pub/vector.xml > ex16_output.txt
The result is ex16_output.txt
