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This article mainly introduces the C language linear algebra algorithm how to realize the matrix, the article introduces in great detail, has a certain reference value, interested friends must read it!

C language realization matrix

As a structure, a matrix should at least contain the number of rows, columns, and data.

# include # include # include typedef struct {int row, col, size; double * data;} Matrix; Special Matrix

Then some special matrices are realized through this structure, such as matrices including the same elements, diagonal matrices and so on.

# define SetBase (mat)\ (Matrix*) malloc (sizeof (Matrix));\ mat- > row = row;\ mat- > col = col;\ mat- > size = row*col;\ mat- > data = (double*) malloc (mat- > size*sizeof (double)) / / Special Matrix Matrix* Sames (double n, int row, int col) {Matrix* mat = SetBase (mat); for (int I = 0; I

Size; iTunes +) mat- > data [I] = n; return mat;} # define Ones (row,col) Sames (1 int Rowl col) # define Zeros (row,col) Sames (0 double Rowl col) Matrix* Diag (double n, int row, int col) {Matrix* mat = Sames (0m Rowl col); for (int I = 0; I

Data [i*col+i] = n; return mat;} # define Eye (row,col) Diag Matrix* CountMatrix (int row, int col) {Matrix* mat = SetBase (mat); for (int I = 0; I

Size; iTunes +) mat- > data [I] = i; return mat;} / / generate random matrices Matrix* RandMat (int row,int col, double L, double R) {Matrix* mat = SetBase (mat); int size=R-L; for (int I = 0; I) in the range of [LMagne R]

Size; iTunes +) mat- > data [I] = rand ()% size+L; return mat;} Special Matrix Verification

Because you want to identify the input function, first create a new function structure

Typedef struct {char* name; int len; int numPara; / / number of parameters double params [MAXLEN]; / / Parameter list} Func

Then generate the Func through the string

/ used to identify the function void initFunc (Func* func,char* str) {int I =-1; int j = 0; while (str[ + + I]! ='(') {} func- > len = I; func- > name = (char*) malloc (sizeof (char) * func- > len); for (j = 0; j

Name [j] = str [j]; func- > name [I] ='\ 0mm; int start = + + i; char temp [MAXLEN]; j = 0; while (str [I]! =')') {if (str[ I] = =',') {temp [i-start] ='\ 0mm; start = iTun1; func- > params [j] = atof (temp) Else temp [i-start] = str[ I]; iTunes;} temp [i-start] ='\ 0mm; func- > params [j] = atof (temp); func- > numPara = jacks 1;}

Next, you need to implement the function of printing matrix.

Void printMat (Matrix* mat) {printf ("mat:"); printf ("% dx%d=%d\ n", mat- > col,mat- > row,mat- > size); for (int I = 0; I

Size; iTunes +) {printf ("% f,", mat- > data [I]); if ((iTun1)% mat- > col==0) printf ("\ n");}}

And finally, the main function.

Int isFunc (Func* func, char* str) {for (int I = 0; I)

Len; iTunes +) {if (func- > name [I]! = str [I]) return FALSE; if (str[ I] = ='\ 0') return FALSE;} return TRUE;} # define intPara (int) func- > params#define floatPara func- > params//#define isFunc (str) strcmp (func- > name,str) int main () {/ / char* str = (char*) malloc (sizeof (char) * MAXLEN) Char str [MAXLEN]; Matrix* mat = NULL; Func* func = (Func*) malloc (sizeof (func)); while (1) {printf ("please input:"); gets (str); initFunc (func,str); if (isFunc (func, "Sames") mat = Sames (floatPara [0], intPara [1], intPara [2]) Else if (isFunc (func, "Ones") mat = Ones (intPara [0], intPara [1]); else if (isFunc (func, "Zeros")) mat = Zeros (intPara [0], intPara [1]); else if (isFunc (func, "Diag") mat = Diag (floatPara [0], intPara [1], intPara [2]) Else if (isFunc (func, "Eye") mat = Eye (intPara [0], intPara [1]); else if (isFunc (func, "CountMatrix")) mat = CountMatrix (intPara [0], intPara [1]) Else if (isFunc (func, "RandMat") mat = RandMat (intPara [0], intPara [1], floatPara [2], floatPara [3]); else continue; printMat (mat);}}

Verify it.

PS E:\ Code\ PL\ calc >.\ a.exeplease input:Ones (4) mat:4x4=161.000000,1.000000,1.000000,1.000000,1.000000,1.000000,1.000000,1.000000,1.000000,1.000000,1.000000,1.000000,1.000000,1.000000,1.000000,1.000000,please input:Zeros (3) mat:5x3=150.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,please input:RandMat (3) mat:3x3=941.000000,67.000000,34.000000,0.000000,69.000000,24.000000,78.000000,58.000000,62.000000 Please input:Eye (3) mat:3x3=91.000000,0.000000,0.000000,0.000000,1.000000,0.000000,0.000000,0.000000,1.000000,please input:CountMatrix (2) mat:4x2=80.000000,1.000000,2.000000,3.000000,4.000000,5.000000,6.000000,7.000000, these are all the contents of the article "how to realize Matrix by Linear Algebra algorithm in C language" Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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