图形计算器
交互式图形上的绘图函数——免费在线图形计算,不注册。
y = f(x), 例如: x^2-3, sin(x), 2*x+1
关于此计算器
A graphing calculator draws the graph of one or more functions of x. Enter equations like y = x^2 - 3 or sin(x), and the calculator plots them on an interactive grid you can zoom and pan. Add several functions at once to compare them, each in its own colour.
It evaluates each function at many x-values across the visible window and joins the points into a smooth curve, redrawing as you scroll to zoom or drag to pan so the axes and grid always rescale to what you are looking at. Any expression the scientific calculator understands works here — polynomials, trigonometry, logarithms, exponentials, roots and combinations — and each function you add is drawn in a distinct colour so several curves can be compared on one grid.
For a worked example, plotting y = x^2 - 3 gives an upward parabola whose lowest point sits at (0, -3) and which crosses the x-axis near x = -1.73 and x = 1.73 (where x^2 = 3). Add y = x - 1 on the same grid and the two curves meet where a line crosses the parabola, giving a visual solution to x^2 - 3 = x - 1. It is used to explore the shape of a function, find roots and intercepts, spot maxima and minima, and see where two graphs intersect.
经常问到的问题
我如何输入函数?
在图形计算计算器中输入 x 中的表达式, 如 x% 2, sin( x) 或 2*x+1。 您可以添加多个函数, 并且每个函数以不同的颜色绘制 。
我能放大和锅吗?
是。 滚动或使用缩放按钮来缩放, 拖动图形来环绕。 轴和网格会自动缩放 。
我能绘制什么函数?
科学计算器支持的任何表达式-多数值、三角、日志、指数、根和组合。
我如何绘制两个函数来找到它们交错的位置?
输入每个函数的行数,例如 Y = x2-3 和y = x - 1. 两次曲线都在同一网格上绘制,它们交叉的点是两个表达式相等的解决方案。
如何用 y = x% 2 - 3 的图解绘制抛物线?
Type x^2 - 3 as the function. The result is a U-shaped parabola with its vertex at (0, -3); zoom out or pan to see where it crosses the x-axis near ±1.73.
我能勾画三角函数吗?
是。输入 sin(x)、cos(x)或tan(x),然后将波画在窗口的对面。将它们与其他词,如sin(x) + x/2结合起来,以查看组合形状。
为什么我的图表看起来空空如也?
曲线可能位于当前视图之外。 缩小或缩小, 直至它进入范围—— 对于陡峭或大值函数, 您通常需要缩放 Y 轴以查看整个形状 。
成果仅是一般指导的估计数,而不是财务、医疗或税务咨询。