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## function MakeArray(n) { this.length = n; for(var i = 0; i < n; i++) this[i] = 0; return this; } function compute_call_amer(S, X, vol, r_f, r_d, t) { if(t <= 0.0) return S - X; else { var iterates = 30; var i, j; var X1, S1, S2, c, e; var u, d, p, q, p1, q1; var s = new MakeArray(iterates + 3); var d2, u2; c = t / iterates; e = Math.exp(r_d * c); u = Math.exp(vol * Math.sqrt(c)); d = 1.0 / u; p1 = (Math.exp((r_d - r_f) * c) - d) / (u - d); q1 = (u - Math.exp((r_d - r_f) * c)) / (u - d); p = p1 / e; q = q1 / e; d2 = d * d; u2 = u * u; X1 = S / X; S1 = X1 * Math.pow(u, iterates + 2); S2 = S1; for(j = 0; j <= iterates + 2; j++) { s[j] = S2 - 1.0; if(s[j] < 0.0) s[j] = 0.0; S2 = S2 * d2; }; S1 = S1 * d; for(i = iterates + 1; 2<= i; i--) { S2 = S1; for(j = 0; j <= i; j++) { s[j] = p * s[j] + q * s[j + 1]; if(s[j] < S2 - 1.0) s[j] = S2 - 1.0; S2 = S2 * d2; }; S1 = S1 * d; }; return s * X; } } function compute(S, X, vol, d, r, t, call, amer) { if(call == 1) return compute_call_amer(S, X, vol, d, r, t, amer); else return compute_call_amer(X, S, vol, r, d, t, amer); } function round_up(x, n) { var i; x = Math.round(x * Math.pow(10.0, n)) / Math.pow(10.0, n); x = "" + x; i = x.indexOf("."); if(i != -1) return x.substring(0, i + n + 1); else return x; } function compute_option(form) { var C, S, X, vol, d, r, t, call, amer, date; S = parseFloat(form.asset.value); X = parseFloat(form.strike.value); vol = parseFloat(form.volatility.value) / 100.0; d = parseFloat(form.dividend.value) / 100.0; r = parseFloat(form.interest.value) / 100.0; t = parseFloat(form.expiration.value); if(form.call.checked == "1") call = 1; if(form.call.checked == "1") call = 0; t = t / 365.0; C = compute(S, X, vol, d, r, t, call, amer); form.option.value = round_up(C, 2); } Option Type : Call Put Strike price Current value of stock/ index Volatility % pa Days left to expiration Option Premium Nifty and stocks volatility (use annual volatility) Volatility Computation Method

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