X quick

Figure 4. Log Log [1/(1 — t,)] as a function of log t when ferrous and ferric hydroxides were precipitated separately and mixed together subsequently,also when 2E ammonia wa.v added to the mixture of ferrous and ferric solutions quickly and slowly. Key , hydroxides O, slow and X, quick.

Let us solve the problem Ax = b, where A has been declared as above and A is a vector containing all ones. Then, we obtain x quickly, taking advantage of the sparse, banded structure of, by typing the code... 

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