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Na\303\257ve Gaussian Elimination Method \302\2512006 Kevin Martin, Autar Kaw, Jamie Trahan University of South Florida United States of America kaw@eng.usf.edu NOTE: This worksheet demonstrates the use of Maple to illustrate Na\303\257ve Gaussian Elimination, a numerical technique used in solving a system of simultaneous linear equations.

One of the most popular numerical techniques for solving simultaneous linear equations is Na\303\257ve Gaussian Elimination method. The approach is designed to solve a set of n equations with n unknowns, [A][X]=[C], where [A]nxn is a square coefficient matrix, [X]nx1 is the solution vector, and [C]nx1 is the right hand side array. Na\303\257ve Gauss consists of two steps: 1) Forward Elimination: In this step, the unknown is eliminated in equation starting with the first equation. This way, the equations are "reduced" to one equation and one unknown in each equation. 2) Back Substitution: In this step, starting from the last equation, each of the unknowns is found. To learn more about Na\303\257ve Gaussian Elimination as well as the pitfalls of the method, click here. A simulation of Na\303\257ve Gauss Method follows. LUklbXJvd0c2Iy9JK21vZHVsZW5hbWVHNiJJLFR5cGVzZXR0aW5nR0koX3N5c2xpYkdGJzYjLUkjbWlHRiQ2JVEhRicvJSdpdGFsaWNHUSV0cnVlRicvJSxtYXRodmFyaWFudEdRJ2l0YWxpY0Yn

Below are the input parameters to begin the simulation. This is the only section that requires user input. Once the values are entered, Maple will calculate the solution vector [X]. Input Parameters: n = number of equations [A] = nxn coefficient matrix [RHS] = nx1 right hand side array Digits = number of significant digits used in calculation restart; n:=4; A:=Matrix([[1,10,100,1000],[1,15,225,3375],[1,20,400,8000],[1,22.5,506.25,11391]]); RHS:=[227.04,362.78,517.35,602.97]; Digits:=10;

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The following sections divide Na\303\257ve Gauss Elimination into two steps: 1) Forward Elimination 2) Back Substitution To conduct Na\303\257ve Gauss Elimination, Maple will combine the [A] and [RHS] matrices into one augmented matrix, [C], that will facilitate the process of forward elimination. with(linalg): C:=augment(A,RHS);

Warning, the protected names norm and trace have been redefined and unprotected

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Forward elimination of unknowns consists of (n-1) steps. In each step k, the coefficient element of the kth unknown will be zeroed from every subsequent equation that follows the kth row. For example, in step 2 (i.e. k=2), the coefficient of x2 will be zeroed from rows 3..n. With each step that is conducted, a new matrix is generated until the coefficient matrix is transformed to an upper triangular matrix. The following procedure calculates the upper triangular matrix while demonstrating the intermediate coefficient matrices that are produced for each step k. with(linalg): #Defining the augmented matrix [C]. C:=augment(A,RHS): print(`start`,C); print(` `); #Conducting k, or (n-1) steps of forward elimination. for k from 1 by 1 to (n-1) do #Defining the proper row elements to transform [C] into [U]. for i from k+1 by 1 to n do #Generating the value that is multiplied to each equation. multiplier:=C[i,k]/C[k,k]: for j from k by 1 to n+1 do #Subtracting the product of the multiplier and pivot equation from the ith row to generate new rows of [U] matrix. C[i,j]:=C[i,j]-multiplier*C[k,j]: end do: end do: print(`step`=k,C): print(` `); end do:

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SSJ+RzYi

The new upper triangular coefficient matrix, [A1], is now: A1:=submatrix(C,1..n,1..n);

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

Notice that the final row, n, has only one unknown to be solved for. The new right hand side array, [RHS1], is: RHS1:=col(C,n+1);

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

This is the end of forward elimination steps. The new upper triangular coefficient matrix and right hand side array permit solving for the solution vector using backward substitution. i:='i': j:='j':

Back substitution begins with solving the last equation as it has only one unknown. The remaining equations can be solved for using the following formula: LyZJInhHNiI2Iy5JImlHRiUqJiwmJkkiY0dGJUYmIiIiLUkkU3VtR0YlNiQqJiZJImFHRiU2JEYnLkkiakdGJUYtJkYkNiNGNUYtL0Y2OywmRihGLUYtRi1RIm5GJSEiIkYtJkYzNiRGJ0YnRj0=

LyZJInhHNiI2I0kiaUdGJSomLCYmSSJjR0YlRiYiIiItSSRTdW1HNiQlKnByb3RlY3RlZEdJKF9zeXNsaWJHRiU2JComJkkiYUdGJTYkRidJImpHRiVGLCZGJDYjRjdGLC9GNzssJkYnRixGLEYsUSJuRiUhIiJGLCZGNTYkRidGJ0Y+

print();

LyZJInhHNiI2I0kiaUdGJSomLCYmSSJjR0YlRiYiIiItSSRTdW1HNiQlKnByb3RlY3RlZEdJKF9zeXNsaWJHRiU2JComJkkiYUdGJTYkRidJImpHRiVGLCZGJDYjRjdGLC9GNzssJkYnRixGLEYsUSJuRiUhIiJGLCZGNTYkRidGJ0Y+

LUklbXJvd0c2Iy9JK21vZHVsZW5hbWVHNiJJLFR5cGVzZXR0aW5nR0koX3N5c2xpYkdGJzYjLUkjbWlHRiQ2JVEhRicvJSdpdGFsaWNHUSV0cnVlRicvJSxtYXRodmFyaWFudEdRJ2l0YWxpY0Yn LUklbXJvd0c2Iy9JK21vZHVsZW5hbWVHNiJJLFR5cGVzZXR0aW5nR0koX3N5c2xpYkdGJzYjLUkjbWlHRiQ2JVEhRicvJSdpdGFsaWNHUSV0cnVlRicvJSxtYXRodmFyaWFudEdRJ2l0YWxpY0Yn #Defining [X] as a vector. X:=Array(1..n): #Solving for the nth equation as it has only one unknown. X[n]:=RHS1[n]/A1[n,n]: #Solving for the remaining (n-1) unknowns working backwards from the (n-1)th equation to the first equation. for i from (n-1) by -1 to 1 do #Setting the series sum equal to zero. summ:=0; for j from i+1 by 1 to n do # summ:=summ+A1[i,j]*X[j]: end do: #Generating the summation term in equation (3.2.1), at which time the unknowns that have been solved for are used to calculate Xi. X[i]:=(RHS1[i]-summ)/A1[i,i]: end do: The solution vector [X] is: X;

LUklbXJvd0c2Iy9JK21vZHVsZW5hbWVHNiJJLFR5cGVzZXR0aW5nR0koX3N5c2xpYkdGJzYlLUkjbW9HRiQ2MFEiW0YnLyUsbWF0aHZhcmlhbnRHUSdub3JtYWxGJy8lJmZlbmNlR1EldHJ1ZUYnLyUqc2VwYXJhdG9yR1EmZmFsc2VGJy8lKXN0cmV0Y2h5R0Y0LyUqc3ltbWV0cmljR0Y3LyUobGFyZ2VvcEdGNy8lLm1vdmFibGVsaW1pdHNHRjcvJSdhY2NlbnRHRjcvJSVmb3JtR1EncHJlZml4RicvJSdsc3BhY2VHUS50aGlubWF0aHNwYWNlRicvJSdyc3BhY2VHRkcvJShtaW5zaXplR1EiMUYnLyUobWF4c2l6ZUdRKWluZmluaXR5RictSSdtdGFibGVHRiQ2NS1JJG10ckdGJDYpLUkkbXRkR0YkNigtSSNtbkdGJDYkUTMmdW1pbnVzMDs0LjIyNzk1NTJGJ0YvLyUpcm93YWxpZ25HUSFGJy8lLGNvbHVtbmFsaWduR0Zpbi8lK2dyb3VwYWxpZ25HRmluLyUocm93c3BhbkdRIjFGJy8lK2NvbHVtbnNwYW5HRmBvLUZXNigtRlo2JFEsMjEuMjU5ODkwMzBGJ0YvRmduRmpuRlxvRl5vRmFvLUZXNigtRlo2JFEtMC4xMzI0MzA2NzEwRidGL0ZnbkZqbkZcb0Zeb0Zhby1GVzYoLUZaNiRRLzAuMDA1NDI1OTg1MDkxRidGL0ZnbkZqbkZcb0Zeb0Zhb0ZnbkZqbkZcby8lJmFsaWduR1ElYXhpc0YnL0ZoblEpYmFzZWxpbmVGJy9GW29RJ2NlbnRlckYnL0Zdb1EnfGZybGVmdHxockYnLyUvYWxpZ25tZW50c2NvcGVHRjQvJSxjb2x1bW53aWR0aEdRJWF1dG9GJy8lJndpZHRoR0ZfcS8lK3Jvd3NwYWNpbmdHUSYxLjBleEYnLyUuY29sdW1uc3BhY2luZ0dRJjAuOGVtRicvJSlyb3dsaW5lc0dRJW5vbmVGJy8lLGNvbHVtbmxpbmVzR0ZqcS8lJmZyYW1lR0ZqcS8lLWZyYW1lc3BhY2luZ0dRLDAuNGVtfjAuNWV4RicvJSplcXVhbHJvd3NHRjcvJS1lcXVhbGNvbHVtbnNHRjcvJS1kaXNwbGF5c3R5bGVHRjcvJSVzaWRlR1EmcmlnaHRGJy8lMG1pbmxhYmVsc3BhY2luZ0dGZ3EtRiw2MFEiXUYnRi9GMkY1RjhGOkY8Rj5GQC9GQ1EocG9zdGZpeEYnRkUvRklRMnZlcnl0aGlubWF0aHNwYWNlRidGSkZN

Using Maple's built-in tools, the exact solution is given below. with(linalg): exactsoln:=linsolve(A,RHS);

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

[1] Autar Kaw, Holistic Numerical Methods Institute, http://numericalmethods.eng.usf.edu/mws, See How does Gaussian Elimination work? Effects of Significant Digits on solution of equations.

LUklbXJvd0c2Iy9JK21vZHVsZW5hbWVHNiJJLFR5cGVzZXR0aW5nR0koX3N5c2xpYkdGJzYjLUkjbWlHRiQ2JVEhRicvJSdpdGFsaWNHUSV0cnVlRicvJSxtYXRodmFyaWFudEdRJ2l0YWxpY0Yn

Maple helped us apply our knowledge of Na\303\257ve Gaussian Elimination method to solve a system of n simultaneous linear equations. Question 1: Change the number of significant digits used in calculations. See how this value affects the accuracy in the solution vector. Question 2: The velocity of a rocket is given at three different times: LUklbXJvd0c2Iy9JK21vZHVsZW5hbWVHNiJJLFR5cGVzZXR0aW5nR0koX3N5c2xpYkdGJzYjLUkjbWlHRiQ2J1EldGltZUYnLyUlYm9sZEdRJXRydWVGJy8lJ2l0YWxpY0dGMS8lLG1hdGh2YXJpYW50R1EsYm9sZC1pdGFsaWNGJy8lK2ZvbnR3ZWlnaHRHUSVib2xkRic= LUklbXJvd0c2Iy9JK21vZHVsZW5hbWVHNiJJLFR5cGVzZXR0aW5nR0koX3N5c2xpYkdGJzYjLUkjbWlHRiQ2J1EpdmVsb2NpdHlGJy8lJWJvbGRHUSV0cnVlRicvJSdpdGFsaWNHRjEvJSxtYXRodmFyaWFudEdRLGJvbGQtaXRhbGljRicvJStmb250d2VpZ2h0R1ElYm9sZEYn LUklbXJvd0c2Iy9JK21vZHVsZW5hbWVHNiJJLFR5cGVzZXR0aW5nR0koX3N5c2xpYkdGJzYlLUkjbW5HRiQ2JFEiNUYnLyUsbWF0aHZhcmlhbnRHUSdub3JtYWxGJy1JI21vR0YkNjBRMSZJbnZpc2libGVUaW1lcztGJ0YvLyUmZmVuY2VHUSZmYWxzZUYnLyUqc2VwYXJhdG9yR0Y4LyUpc3RyZXRjaHlHRjgvJSpzeW1tZXRyaWNHRjgvJShsYXJnZW9wR0Y4LyUubW92YWJsZWxpbWl0c0dGOC8lJ2FjY2VudEdGOC8lJWZvcm1HUSZpbmZpeEYnLyUnbHNwYWNlR1EkMGVtRicvJSdyc3BhY2VHRkovJShtaW5zaXplR1EiMUYnLyUobWF4c2l6ZUdRKWluZmluaXR5RictSSNtaUdGJDYlUSRzZWNGJy8lJ2l0YWxpY0dRJXRydWVGJy9GMFEnaXRhbGljRic= 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 LUklbXJvd0c2Iy9JK21vZHVsZW5hbWVHNiJJLFR5cGVzZXR0aW5nR0koX3N5c2xpYkdGJzYlLUkjbW5HRiQ2JFEiOEYnLyUsbWF0aHZhcmlhbnRHUSdub3JtYWxGJy1JI21vR0YkNjBRMSZJbnZpc2libGVUaW1lcztGJ0YvLyUmZmVuY2VHUSZmYWxzZUYnLyUqc2VwYXJhdG9yR0Y4LyUpc3RyZXRjaHlHRjgvJSpzeW1tZXRyaWNHRjgvJShsYXJnZW9wR0Y4LyUubW92YWJsZWxpbWl0c0dGOC8lJ2FjY2VudEdGOC8lJWZvcm1HUSZpbmZpeEYnLyUnbHNwYWNlR1EkMGVtRicvJSdyc3BhY2VHRkovJShtaW5zaXplR1EiMUYnLyUobWF4c2l6ZUdRKWluZmluaXR5RictSSNtaUdGJDYlUSRzZWNGJy8lJ2l0YWxpY0dRJXRydWVGJy9GMFEnaXRhbGljRic= LUklbXJvd0c2Iy9JK21vZHVsZW5hbWVHNiJJLFR5cGVzZXR0aW5nR0koX3N5c2xpYkdGJzYmLUkjbW5HRiQ2JFEmMTc3LjJGJy8lLG1hdGh2YXJpYW50R1Enbm9ybWFsRictSSNtb0dGJDYwUTEmSW52aXNpYmxlVGltZXM7RidGLy8lJmZlbmNlR1EmZmFsc2VGJy8lKnNlcGFyYXRvckdRJXRydWVGJy8lKXN0cmV0Y2h5R0Y4LyUqc3ltbWV0cmljR0Y4LyUobGFyZ2VvcEdGOC8lLm1vdmFibGVsaW1pdHNHRjgvJSdhY2NlbnRHRjgvJSVmb3JtR1EmaW5maXhGJy8lJ2xzcGFjZUdRJDBlbUYnLyUncnNwYWNlR1EvdGhpY2ttYXRoc3BhY2VGJy8lKG1pbnNpemVHUSIxRicvJShtYXhzaXplR1EpaW5maW5pdHlGJy1JKG1mZW5jZWRHRiQ2JC1GIzYlLUkjbWlHRiQ2JVEhRicvJSdpdGFsaWNHRjsvRjBRJ2l0YWxpY0YnLUkmbWZyYWNHRiQ2KC1GZW42JVEibUYnRmhuRmpuLUZlbjYlUSJzRidGaG5Gam4vJS5saW5ldGhpY2tuZXNzR1EiMUYnLyUrZGVub21hbGlnbkdRJ2NlbnRlckYnLyUpbnVtYWxpZ25HRmpvLyUpYmV2ZWxsZWRHRjhGWkYvRlo= 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 The velocity data is approximated by a polynomial as v(t) = a1 t2 + a2 t + a3, 5< t <12 The coefficients a1, a2, a3 for the above expressions were found to be given by LUklbXJvd0c2Iy9JK21vZHVsZW5hbWVHNiJJLFR5cGVzZXR0aW5nR0koX3N5c2xpYkdGJzYuLUkjbWlHRiQ2JVEhRicvJSdpdGFsaWNHUSV0cnVlRicvJSxtYXRodmFyaWFudEdRJ2l0YWxpY0YnLUYjNiUtRiw2JVEnTWF0cml4RidGL0YyLUkjbW9HRiQ2MFEwJkFwcGx5RnVuY3Rpb247RicvRjNRJ25vcm1hbEYnLyUmZmVuY2VHUSZmYWxzZUYnLyUqc2VwYXJhdG9yR0ZCLyUpc3RyZXRjaHlHRkIvJSpzeW1tZXRyaWNHRkIvJShsYXJnZW9wR0ZCLyUubW92YWJsZWxpbWl0c0dGQi8lJ2FjY2VudEdGQi8lJWZvcm1HUSZpbmZpeEYnLyUnbHNwYWNlR1EkMGVtRicvJSdyc3BhY2VHRlQvJShtaW5zaXplR1EiMUYnLyUobWF4c2l6ZUdRKWluZmluaXR5RictSShtZmVuY2VkR0YkNiQtRiM2JUYrLUZobjYmLUYjNilGKy1GaG42Ji1GIzYnLUkjbW5HRiQ2JFEjMjVGJ0Y+LUY7NjBRIixGJ0Y+RkAvRkRGMUZFRkdGSUZLRk1GT0ZSL0ZWUTN2ZXJ5dGhpY2ttYXRoc3BhY2VGJ0ZXRlotRmVvNiRRIjVGJ0Y+RmhvLUZlbzYkRllGPkY+LyUlb3BlbkdRIltGJy8lJmNsb3NlR1EiXUYnRmhvLUZobjYmLUYjNictRmVvNiRRIzY0RidGPkZoby1GZW82JFEiOEYnRj5GaG9GYXBGPkZjcEZmcEZoby1GaG42Ji1GIzYnLUZlbzYkUSQxNDRGJ0Y+RmhvLUZlbzYkUSMxMkYnRj5GaG9GYXBGPkZjcEZmcEYrRj5GY3BGZnBGK0Y+RistRiM2JS1GLDYlUSdWZWN0b3JGJ0YvRjJGOi1GaG42JC1GIzYnLUZlbzYkUSIzRidGPkZoby1GLDYlUSdzeW1ib2xGJ0YvRjItRjs2MFEiPUYnRj5GQEZDRkVGR0ZJRktGTUZPL0ZTUS90aGlja21hdGhzcGFjZUYnL0ZWRmBzRldGWi1GLDYlUSJhRidGL0YyRj5GXHMtRjs2MFEiPEYnRj5GQEZDRkVGR0ZJRktGTUZPRl9zRmFzRldGWi1GZW82JFEmMTA2LjhGJ0Y+RmhvLUZlbzYkUSYxNzcuMkYnRj5GaG8tRmVvNiRRJjI3OS4yRidGPi1GOzYwUSI+RidGPkZARkNGRUZHRklGS0ZNRk9GX3NGYXNGV0Za

LV9JLFR5cGVzZXR0aW5nR0koX3N5c2xpYkc2IkksbXByaW50c2xhc2hHRiY2JDcjLy1JJ1JUQUJMRUdGJjYlIip3SXZZIi1JJ01BVFJJWEdGJjYjNyU3IywoKiYiI0QiIiImSSJhR0YmNiNGN0Y3RjcqJiIiJkY3JkY5NiMiIiNGN0Y3JkY5NiMiIiRGNzcjLCgqJiIja0Y3RjhGN0Y3KiYiIilGN0Y9RjdGN0ZARjc3IywoKiYiJFciRjdGOEY3RjcqJiIjN0Y3Rj1GN0Y3RkBGNyZJJ1ZlY3Rvckc2JCUqcHJvdGVjdGVkR0YlNiNJJ2NvbHVtbkdGJi1GLDYlIipPUlhZIi1GMDYjNyU3IyQiJW81ISIiNyMkIiVzPEZobjcjJCIlI3ojRmhuRk83Iy8tRk82Iy9JJCVpZEdGJkYuLUZPNiMvRmRvRlc=

print();

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

Question 3: Choose a set of equations that has a unique solution but for which Na\303\257ve Gauss Elimination method fails.

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