Search Results
| Search type | Search syntax |
|---|---|
| Tags | [tag] |
| Exact | "words here" |
| Author |
user:1234 user:me (yours) |
| Score |
score:3 (3+) score:0 (none) |
| Answers |
answers:3 (3+) answers:0 (none) isaccepted:yes hasaccepted:no inquestion:1234 |
| Views | views:250 |
| Code | code:"if (foo != bar)" |
| Sections |
title:apples body:"apples oranges" |
| URL | url:"*.example.com" |
| Saves | in:saves |
| Status |
closed:yes duplicate:no migrated:no wiki:no |
| Types |
is:question is:answer |
| Exclude |
-[tag] -apples |
| For more details on advanced search visit our help page | |
Results tagged with equation-solving
Search options not deleted
user 20056
Questions on the analytic and numerical equation solving functions of Mathematica (Solve, Reduce, NSolve, FindRoot, DSolve, RSolve, etc.).
1
vote
1
answer
87
views
Problems solving a differential equation
I am trying to solve a differential equation:
$dN/dt = a*N*(90-N)$ with $N(0)=3$ and $N(11)=43$:
Using:
DSolve[{n'[t] == a*n[t]*(90 - n[t]), n[0] == 3}, n[t], t])
I get:
{{n[t] -> (90 E^(90 a …
- 11.9k
0
votes
0
answers
69
views
Problem with solving an equation [duplicate]
I dont understand why Mathematica cannot solve this equation:
Solve[Log[x^2 + 5] + 0.5 x + 1 == 0, x]
I get this error message:
Solve::inex: Solve was unable to solve the system with inexact coeffi …
