# Tagged Questions

Questions about the use of built-in Mathematica functions, including pure functions.

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### Derivative of a function with indexed variables

I want to show that $$\mathcal{U}(\mathbf x)=\prod_{i=1}^n U_i(x_i)$$ is a concave function, where $$U_i(x_i)=\frac{c_i}{1+e^{b_i-a_i x_i}}+d_i$$ and $a_i$, $b_i$, $c_i$, and $d_i$ are positive ...
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### Reversing the order of Outer

I'm trying to use a function with two slots that I want to map over lists of different lengths and I think Outer is the function I need to solve the problem. I tried the following example: ...
123 views

### Build nested function

By running the following code: ...
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### Using RegionFunction with non-trivial Inequality

So I have been using ContourPlot to plot the zero set of a fairly unwieldy function, with many intersecting components. There's really only one of these components ...
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### Union sorting after ignoring some digits

I have a list with its bellow elements: {-0.7071067811865476, -0.7071067811865475, 0.7071067811865475, 0.7071067811865476} If I use ...
121 views

### How to 3D-plot with specific ranges?

I have the following function which I want to plot using Plot3D: (-1 + w + 3 s w)/(2 (-1 + w + 4 s w)) , which is only ...
11k views

### Calling Correct Function for Plotting DiracDelta

I am wondering what is the correct function in Mathematica to plot the true impulse function, better known as the DiracDelta[] function. When using this inside of a ...
618 views

### Is the renaming mechanism of With flawed?

I'm confused about the renaming mechanism of With: ...