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| Dear All, May I ask you something? I plotted a runoff (q) probability in 3D. I am expecting that the obtained result will show the variation of q. Thus, may I know how to extract the values of q in the peak time, like in this case time to peak is... |
| Dear All, May I ask you? If I have an equation as follows: y[t_]:= x[t] Exp[x[t]] where x = 1/z and z varies from 0 to a certain number. Thus, some values of x contains "Complex Infinity" when z = 0. Thus, when I tried to solve the... |
| Dear All, May I ask you something? I have over-plotting result of 61 curves (please refer to below image). x axis refers to time in hour, and y axis refers to rainfall (mm/h). ![enter image description here][1] Thus, is that possible to take... |
| Dear All, I have the below equation: sol = NDSolve[{q'[t] == (a q[t]^b newefr[t] - q[t]) + (a q[t]^b (newefr[t] - newefr1[t])), q[1] == 0.001}, q, {t, 1, 456}] Then I want to extract the value of q for each time step by using below... |
| Dear All, I got error message when trying to solve an equation by using NDSolve command. This is my equation: sol = NDSolve[{q'[t] == (a q[t]^b newefrainfunc[t] - q[t]) + (a q[t]^b sigmaer1[t]), q[1] == q0}, q, {t, 1, 456}] where: a,... |
| Dear All, I want to ask your advice about clustering method. I have rock type data for 22 catchments and the data consists of the area of each rock type in terms of percentage and also in km^2 (please refer to the excel sheet as per attached). By... |
| Dear All, I am wondering about the principal of combination method. The combination formula is nCr to define the number of possible combinations of r objects from a set of n objects. So nCr = n!/(r!(n-r)! But for my case, I have 2 unknowns which I... |
| Dear All, Usually we can obtain n unknowns by using n equations. But I want to obtain the best fit 2 unknowns for 12 equations. I tried to use below command: FindRoot[{a b Sech[266 b] == 0.391, a b Sech[128.3 b] == 0.3169, a b Sech[158.5 b] ==... |
| Dear All, I am using Mathematica version 9 for Windows and I want to run a script written by my friend and he is using Mathematica version 8. Whenever I open his script, I got a notification "Continue with updated styling" or "Revert to older... |
| Dear All, I want to ask your advise. I have a variable q as a function of time but I already have the values of q for each time step. So do you know any command in Mathematica for getting the derivative values of q? There are some commands such as:... |