Please convert this c program into matlab code

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PULAK Kumer
PULAK Kumer 2020-11-26
回答： PULAK Kumer 2020-11-26
#include<stdio.h> #include<math.h> int main() { float x[10],y[15][15]; int n,i,j; printf("Enter n : "); scanf("%d",&n); printf("X\tY\n"); for(i = 0;i<n;i++){ scanf("%f %f",&x[i],&y[i][0]); } //forward difference table for(j=1;j<n;j++) for(i=0;i<(n-j);i++) y[i][j] = y[i+1][j-1] - y[i][j-1]; printf("\n***********Forward Difference Table *********\n"); //display Forward Difference Table for(i=0;i<n*2-1;i++) { int indx = i/2; printf("\t"); if(!(i%2)) printf("%.2f",x[indx]); int j_max = (n>i)? i : n*2-i-1; for(j=0;j<=j_max;j++) { printf("\t"); if(i%2 == j%2) printf("%.2f",y[indx-j/2][j]); } printf("\n"); }
return 0; }

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回答（2 个）

Walter Roberson
Walter Roberson 2020-11-26
That code cannot be converted to MATLAB: it depends on standard input for reading from the user, but MATLAB does not have standard input.
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PULAK Kumer
PULAK Kumer 2020-11-26
编辑：Walter Roberson 2020-11-26
If this code was started from index 1(array index) instead of 1 then what will be done for the following part?
for(i=0;i<n*2-1;i++) { int indx = i/2; printf("\t"); if(!(i%2)) printf("%.2f",x[indx]); int j_max = (n>i)? i : n*2-i-1; for(j=0;j<=j_max;j++) { printf("\t"); if(i%2 == j%2) printf("%.2f",y[indx-j/2][j]); } printf("\n"); }
Walter Roberson
Walter Roberson 2020-11-26
OFFSET = 1;
for i=0 : n*2-2
indx = floor(i/2);
fprintf("\t");
if mod(i,2) == 0
fprintf("%.2f",x(indx+OFFSET));
end
if n > i
j_max = i;
else
j_max = n*2-i-1;
end
for j = 0 : j_max
fprintf("\t");
if mod(i,2) == mod(j,2)
fprintf("%.2f", y(indx-j/2+OFFSET, j+OFFSET));
end
printf("\n");
end
end

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PULAK Kumer
PULAK Kumer 2020-11-26
What is the wrong for the following code:
clc;
clear all;
close all;
fprintf('\n************************************************************');
fprintf('\n****************** NIRALI PUBLICATIONS *********************');
fprintf('\n******** CONM by M. T. Puranik & V. N. Chougule ************');
fprintf('\n*** Interpolation by Newtons Forward Difference Formula ***');
fprintf('\n************************************************************');
n = input('\nEnter number of data points = ');
h = input('\nEnter step size (h) = ')
x(1) = input('\nx0 = ');
y(1) = input('y0 = ');
for i=2:n
x(i)=x(i-1)+h;
fprintf('\nX%d = %f',i,x(i));
fprintf('\t\tY%d: ',i);
y(i) = input('');
end
x_reqd = input('\nEnter X for which value of Y is sought: ');
s=(x_reqd-x(1))/h;
for i=1:n
diff(i,1)=y(i);
end
%% Calculate Forward Differance Table
for j=2:n
for i=1:n-j+1
diff(i,j)=diff(i+1,j-1)-diff(i,j-1);
end
end
fprintf('\n\t Forward Differance Table');
fprintf("\n");
fprintf("============================================================================")
fprintf("\n");
fprintf("x\t\t\ty\t\t\tdy");
for j=2:1:n-1
fprintf("\t\t\t");
fprintf("D%dy",j);
end
fprintf("\n");
fprintf("============================================================================")
%% Print Forward Differance Table
offset=1;
for i=0:n*2-2
index=floor(i/2);
fprintf("\t\t")
if mod(i,2)==0
fprintf('\n %.6f',x(index+offset));
end
if n>i
j_max=i
else
j_max=n*2-i-1
end
for j=0:j_max
if mod(i,2)==mod(j,2)
fprintf('\t\t%.6f',diff(index-j/2+offset,j+offset));
end
end
end

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