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# Array Basics in FORTRAN 95

 Subscripted Variables In algebra and in FORTRAN 95 Xi , Yj, Zk X (i), Y (j), Z (k) REAL , DIMENSION(10) :: X, Y ,Z, W Operations : 1. Summation x_ sum = S Xi x_ sum = SUM (X) 2. Product y_ prd = ? Yj y_ prd =PRODUCT (Y) Arrays * Operations Using FORTRAN 95 library functions 1. Maximum value x_ max=MAXVAL (X) 2. Minimum value y_ min=MINVAL (Y) 3. Assigning values Z = -2.5 ! For all! 4. Changing a value X(3) = 4.8 ! Just one! 5. Changing values Y(1:5:2) = 1.52 Which? 6. Applying DO loops (See: s10_adn.F) Array Features in FORTRAN 95 Library function: MAXVAL z_max = MAXVAL(Z, MASK=Z>0) Library function: MATMUL d_mult = MATMUL(X,Y) Adding matrices : W = X + Z Note: See Appendix in the text book! Are you ready for a bonus point quiz? Two -dimensional Arrays REAL , DIMENSION(6,6) :: AA, BB, CC INTEGER :: j, k, n =6 DO j = 1, n DO k = 1, n AA(j,k) = j**k + k/j BB(j,k) = (k+j)**2 – k*j END DO END DO Sketch the flow chart , please! Flow Chart for Nested Do Loops Let Us See The Solution ! How Much Time Was Used? Getting Some Fresh Air
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