gradient

问题 I have the following set of points in 3d-space and D'd like to calculate the gradient everywhere, i.e. have a vector field returned. points = [] for i in np.linspace(-20,20,100): for j in np.linspace(-20,20,100): points.append([i,j,i**2+j**2]) points = np.array(points) It's an elliptic paraboloid. Using np.gradient(points) , http://docs.scipy.org/doc/numpy/reference/generated/numpy.gradient.html I neither get the correct values nor the dimension I would expect. Can anyone give me a hint? 回答1:

问题 I am having a great deal of difficulty with getting rid of the white space at the bottom when I apply a CSS3 gradient and the content has insufficient height for a scrollbar. Such as here: http://womancareolympia.webs.com/ I have tried playing with setting both html and body heights to 100% or auto. I am able to make the gradient go to the bottom this way, but then when content requires a scrollbar, the content flows past the gradient. Thanks for the help! 回答1: Add min-height: 100% to body .

问题 I'm trying to generate a graph with gradient/shading effect. Now I'm able to draw line graph and applied gradient effect to that graph. It is applying to whole view not to the graph. Now I'm getting image like this. But I want like this. I want gradient effect just under the graph. Please help me in this. Thanks in advance. The code that I'm using is: UIGraphicsBeginImageContext(self.graphView.frame.size); [graphView.image drawInRect:CGRectMake(0, 0, self.graphView.frame.size.width, self

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 4 years ago . Simply put, I need to put a gradient on a dynamically sized circle with a transparent background. Is there a way to recreate the following image in CSS/HTML ? As far as I can tell, neither radial gradients nor border-images are able to construct this shape. The key is that the center of the circle needs to be

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 4 years ago . Simply put, I need to put a gradient on a dynamically sized circle with a transparent background. Is there a way to recreate the following image in CSS/HTML ? As far as I can tell, neither radial gradients nor border-images are able to construct this shape. The key is that the center of the circle needs to be

问题 I am trying to get derivative of output of a Keras model with respect to the input (x) of the model (not the weights). It seems like the easiest way is to use "gradients" from keras.backend which returns a tensor of gradients (https://keras.io/backend/). I am new with tensorflow and not comfortable with it yet. I have got the gradient tensor, and trying to get numerical values for it for different values of input (x). But it seems like the gradient value is independent of the input x (which

问题 I am trying to get the Gradient Vector Field of an image using Python (similar to this matlab question). This is the original image: Here is my code: import numpy as np import matplotlib.pyplot as plt import Image from PIL import ImageFilter I = Image.open('test.png').transpose(Image.FLIP_TOP_BOTTOM) I = I.filter(ImageFilter.BLUR) p = np.asarray(I) w,h = I.size y, x = np.mgrid[0:h:500j, 0:w:500j] dy, dx = np.gradient(p) skip = (slice(None, None, 3), slice(None, None, 3)) fig, ax = plt

问题 I want to place a gradient over an <img> tag. src attribute of the tag is angular-item. For example: <img src={{value.angitem.image}}> I've tried to make css class: .pickgradient { background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(0,0,0,0)), color-stop(100%,rgba(0,0,0,0.65))); } and <img src={{value.angitem.image}} class="pickgradient "> but it doesn't work. What should I do? 回答1: With z-index : You may use a container and put the gradient on that container. Then

问题 Question, if I wanted to create gradient lines that fade out on the top and bottom, similar to the lines seen on AT&T's drop down menu that separate the menu items, how would I go about that? I want to create a similar effect on a menu that I am coding, and I would prefer not to use images. Is there a way to achieve this in CSS? Help much appreciated! Thanks. 回答1: Microsoft CSS Gradient is a GUI you can use. just copy the CSS into your code: Example: #div { /* IE10 Consumer Preview */

问题 How do I add a gradient facecolor to my bar plots? I want to know how to use simple one-color gradients to complex multicolor gradients. Here is some example code: import numpy as np import matplotlib.pyplot as plt plt.figure(figsize=(1,5)) plt.axis([0,1,-50,200]) plt.xticks([]) plt.yticks([-40,180]) plt.bar(left=0, width=1, bottom=-40, height=220, color='r') plt.subplots_adjust(left=0.4, right=0.8) plt.savefig("test.png") 回答1: import numpy as np import matplotlib as mpl import matplotlib