fix final main.c matutil.c matutil.h and add hw3.txt and README.md

hws/hw3/README.md

@@ -0,0 +1,27 @@
+# Numerical Analysis Homework 3
+
+## Compile Alert
+
+This source file contain UNIX `fork` function!!! please compile and run in Ubuntu.
+
+when compiling source, must be included below c file
+
+```makefile
+nr/ansiother/nrutil.c nr/ansirecipes/gaussj.c nr/ansirecipes/ludcmp.c nr/ansirecipes/svdcmp.c nr/ansirecipes/mprove.c nr/ansirecipes/lubksb.c nr/ansirecipes/pythag.c main.c matutil.c
+```
+
+and include dir `nr/ansi/other` and `$(workspace)`(this folder)
+
+cflags are:
+```makefile
+CFLAGS := -Wno-unused-but-set-variable -Wno-unused-parameter -Wno-unused-variable -Wall -g -std=c90
+LDFLAGS := -lm
+```
+
+**executable should be located in the same folder as the *.dat file.**
+
+## Results & Report
+
+Compile, build and run results are included in hw3.txt
+
+The report is the output of a compilation executable.