why cant select any components on schematic with mouse left button.

Hi OliverLiu ,

What do you mean "Select"? What are you trying to do? 

mike

OliverLiu,

Use the mouse's Right button to select components.

The mouse's left button is for plotting waveforms.

Andy

Alex,

"Picking up" a component's symbol so that you can rotate or move it, requires "grabbing" it first.  That does not happen until you select the tool to grab it.  There are two tools in LTspice's toolbar for selecting or grabbing components.  They are in the shape of a hand, and called "Move" or "Grab".  I think F7 and F8 are their hotkeys, but hotkeys can be reconfigured so they might not be the same on your computer.

First click either of these two toolbar buttons.  THEN click your component with left-click, and now it will be "grabbed" and can be moved or rotated.

"Move" picks up just the component.  "Drag" picks up the component and leaves its wires attached, so they will move with the component.

Andy

Hi Alex73 ,

As AndyI  describes:

AndyI said:

"Picking up" a component's symbol so that you can rotate or move it, requires "grabbing" it first. 

Another way of saying LTspice is a little backward, and can take a moment to get used to. As most design apps use a "Select then do" interface, LTspice uses an interface that uses a "Command then select" interface.

From the LTspice Help:

LTspice schematic editing is a "verb-noun" interface instead of "noun-verb." This means that instead of first selecting objects (the nouns) to move, stretch, copy, or delete (the verbs); you first select the action and then the object. Hence, when you wish to move, mirror, rotate, stretch or delete objects, first select the move, stretch or delete command. Then you can select an object by clicking on it. You can select multiple objects by dragging a box about them. The program will stay in the move, stretch, or delete mode until the right mouse button is clicked or the Esc key is pressed. The verb-noun approach reduces the amount of mouse syntax required to edit schematics. Once mastered, it allows the user to draft faster in LTspice than is possible with pencil and paper.

In the latest versions of LTspice, the keystroke shortcuts are available under the Help menu and show up as tool tips.

And here.

mike