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matrix.pas
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program matrix_solver; | |
const | |
MAX_LEN = 10; | |
type | |
MATRIX = record | |
m : array [1..MAX_LEN, 1..MAX_LEN] of real; | |
n : integer; | |
end; | |
var | |
m : MATRIX; | |
x, y : integer; | |
{ | |
Считает количество символов, которыми записано | |
заданое число. | |
} | |
function calc_size(a:real):integer; | |
begin | |
calc_size := length(floattostr(a)); | |
end; | |
{ | |
Выводит заданое количество пробелов. | |
} | |
procedure print_space(n: integer); | |
var | |
i : integer; | |
begin | |
for i := 1 to n do | |
write(' '); | |
end; | |
{ | |
Вывод текущего состояния матрицы. | |
} | |
procedure print_matrix(var m: MATRIX); | |
var | |
s : array [1..MAX_LEN] of integer; | |
x, y, k:integer; | |
begin | |
for x := 1 to m.n do begin | |
for y := 1 to m.n do begin | |
k := calc_size(m.m[x, y]); | |
if k > s[x] then s[x] := k; | |
end; | |
inc(s[x]); | |
end; | |
for y := 1 to m.n do begin | |
for x := 1 to m.n do begin | |
write(m.m[x, y]); | |
k := calc_size(m.m[x, y]); | |
print_space(s[x] - k); | |
end; | |
writeln(); | |
end; | |
end; | |
procedure read_matrix(var m : MATRIX); | |
var | |
x, y:integer; | |
begin | |
write('Введите размерность матрицы: '); | |
readln(m.n); | |
for y := 1 to m.n do begin | |
if y <> 1 then | |
writeln(); | |
for x := 1 to m.n do begin | |
write('a(', x, ';', y, '): '); | |
readln(m.m[x, y]); | |
end; | |
end; | |
end; | |
{ | |
Сводит часть одной колонки матрицы | |
к нулю. | |
} | |
procedure subtract_row(var m : MATRIX; row : integer); | |
var | |
k : array[1..MAX_LEN] of real; | |
i, x, y, column : integer; | |
begin | |
column := row + 1; | |
// Посчитать коэфициенты. | |
for i := column to m.n do | |
k[i] := m.m[row, i] / m.m[row, row]; | |
// Пересчет матрицы. | |
for y := column to m.n do | |
for x := row to m.n do | |
m.m[x, y] := m.m[x, y] - k[y] * m.m[x, row]; | |
end; | |
function calc_determinant(m : MATRIX; log : boolean):real; | |
var | |
i:integer; | |
d:real; | |
begin | |
for i := 1 to m.n - 1 do begin | |
subtract_row(m, i); | |
if log then begin | |
print_matrix(m); | |
writeln(); | |
end; | |
end; | |
d := 1; | |
for i := 1 to m.n do | |
d := d * m.m[i, i]; | |
calc_determinant := d; | |
if log then writeln('Определитель: ', d); | |
end; | |
begin | |
read_matrix(m); | |
writeln('-----------------'); | |
writeln('Исходная матрица:'); | |
print_matrix(m); | |
writeln('-----------------'); | |
writeln('Решение:'); | |
calc_determinant(m, true); | |
end. |
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